I didn't immediately recognize it as the cruise stage because it's so much smaller than Curiosity's cruise stage. Curiosity needed bigger solar panels, but more importantly, needed a big ring of radiators and lots of plumbing behind them to get rid of waste heat from the RTG that would otherwise be really hazardous to the rover and its rocket-fueled descent backpack that was sealed up inside the capsule.

I'll post more about InSight once the mission releases the always-informative launch press kit. But in the meantime, you can put launch day on your calendars. Launch will happen super early in the morning. If it happens on May 5, the launch window opens at 4:05 a.m. PDT (11:05 UT). Since I'm local, I could go attend the launch in person. But Vandenberg launches are notoriously foggy, and cell coverage is minimal, so I'm leaning toward watching the launch from the comfort and relative Internet accessibility of my couch.