Last Friday, just like Punxsutawney Phil, DC District Court judge Beryl Howell emerged from her chambers, saw her shadow, and announced six more months of Bob Mueller. Judge Howell’s extension of Mueller’s grand jury, which was set to expire over the weekend, was widely expected—the special counsel’s office has made clear in recent weeks that it has plenty of unfinished business—but the extension underscores just how much work is still left in Mueller’s probe.

In fact, surveying the 2019 landscape anew after a flurry of near-daily investigation revelations in the month following Thanksgiving makes clear that Mueller’s investigation has a packed agenda still ahead (not to mention a final report to write). Here are some of the loose threads and unanswered questions that seem most likely to be topping Mueller’s to-do list as January begins:

What happens to Jerome Corsi?

One of the most intriguing pieces of unfinished business from Mueller’s Thanksgiving flurry was the aborted plea agreement with conspiracy theorist and would-be Wikileaks intermediary Jerome Corsi. Mueller clearly believes that Corsi lied to investigators about his knowledge or role in Wikileaks’ publishing of emails and documents stolen from Democratic officials by Russian hackers. Yet despite all the activity around Corsi, some intriguing movement about Wikileaks founder Julian Assange’s years-long asylum in the Ecuadorian embassy in London, and news about charges Assange may face in the US, the Corsi thread went cold in December.

Will there be a big Middle East report or indictment(s)?

Just before the holidays, the Daily Beast reported that Mueller is moving toward making public one of his most-investigated-yet-least-seen inquiries: The impact of Middle Eastern influence in the 2016 campaign, focused around would-be power broker George Nader and Blackwater mercenary group founder Erik Prince (brother of Education secretary Betsy DeVos). Prince, who is apparently cooperating with Mueller, told CNBC Monday that he’d rather receive a “proctology exam” than be questioned by the special counsel’s team.

What was Paul Manafort doing meeting with the grand jury?

One of the surprises buried in Mueller’s December court filings documenting Paul Manafort’s ongoing obfuscations was that Manafort twice testified before Mueller’s grand jury. That’s potentially deeply significant precisely because we know that Mueller thinks Manafort was lying repeatedly. The fact that they put him before a grand jury means that on whatever subject he was testifying, there’s ample and important documentary evidence to back up (and box in) any grand jury testimony. We have yet to see what fruits that case may bear.

What happens to Michael Flynn?

The onetime national security adviser’s aborted sentencing in December was one of the month’s oddest turns, as a furious judge encouraged Flynn to keep cooperating rather than face what appeared likely to be jail time. Judge Emmet Sullivan blasted Flynn: “Arguably, you sold your country out.” Sullivan got to read more than was publicly released both about Flynn’s cooperation and his crimes—and was clearly troubled by what he learned regarding Flynn’s behavior. Is there more troubling information to come about Flynn that’s relevant to one of the other investigations where he’s cooperating?

What, if anything, does Maria Butina’s cooperation get Mueller?

There are complicated geopolitical machinations underway in the case of NRA hanger-on and Russian agent Maria Butina, who pleaded guilty in December to charges known as “espionage lite” and promised to cooperate with investigators as they trace her 2016 election contacts. Now, Russia has detained an American, an unlikely espionage agent, in what appears to be an effort to jumpstart a prisoner exchange—an exchange perhaps meant to cut short that very cooperation. Court papers have already pointed the finger at Russian banker-slash-handler Alexander Torshin. Is he next in the government’s crosshairs? The Butina case has always been one of the oddest threads of the Russia investigation. It could be entirely unrelated, or it could be deeply central.

What are Konstantin Kilimnik’s ties to Russian intelligence?

Mueller’s court filings have laid out that the special counsel believes that Kilimnik, Paul Manafort’s business partner and codefendant, had ties to Russian intelligence in 2016. Yet we haven’t seen evidence of why Mueller believes that—and, more important, what relevance that has to the Trump campaign.

Who else lied to Congress?

This week’s Democratic takeover of the House of Representatives is likely to begin a flood of documents from Capitol Hill to Mueller’s team. When Michael Cohen was charged by Mueller with lying to Congress, it opened a new investigative angle—and new House Intelligence chair Adam Schiff made clear that he thinks there are other aides who lied before his committee—paging Donald Trump Jr.—and that he plans to turn over evidence and those transcripts to Mueller as he takes over the committee from Republican Devin Nunes.

What happens with obstruction?

Over the course of 2018, we saw significant movement across all four major areas of Mueller’s probe into Russia’s role in the 2016 election—indictments around past Russian business deals and money laundering; indictments of the Internet Research Agency for its information-influence operations on Twitter, Facebook, and other social media sites (a case that continues to play in colorful ways); indictments of Russian military intelligence officers for the theft and publication of Democratic emails and an attack on state-level voting systems; and then indictments of Trump campaign officials for lying about their contacts with Russian officials.