On Faeit he has a picture of a book cover for a "Militarum Tempestus", while the other link shows the Astra Militarum book cover. As such, and as noted in the comments for Faeit's post, it seems like we are looking at a codex + supplement release in the next month or so for IG.
The new vehicle looks meh to me, I think it would have looked better on wheels tbh or as a half-track (the best option imo).
The command squad looks ripe for kit bashing opportunities though, I'm looking forward to picking up a couple of them!
Gotta agree about the extended release timetable. I'll still be buying IG stuff (not ready to call them 'AM' yet) but I'm definitely going to wait until I get the rules in my hand before spending anything!