A new site bearing the Halo 5 logo and a countdown has emerged on Tumblr.

It features a picture of a bullet emblazoned with the word, “Traitor.” There is also a countdown with about three days left on the clock, putting the reveal of… something, on Sunday.

The blog itself is titled “Hunt the Truth,” and includes a link to tweet about the countdown using the hashtag #HUNTtheTRUTH.

We’re working right now to verify the legitimacy of the site, but what do you think? Viral marketing? Hoax? Either way, we’ll find out on Sunday.

Update: This has been confirmed to be real. It was tweeted by 343 Industries’ Frank O’Connor.