Editing as I read through and see more things.
7e FAQs have been posted. First glance at the armies important to me show a Heldrake weapon nerf--hull-mounted weapon measuring from the barrel, now. Eh, it's not like it wasn't merited. Also, any Daemons can use Daemonology, down to and including Horrors.
For Nids, Shadows in the Warp isn't touched on. Odd. Tzeentch Daemon +3 on Ld still is useless, too.
As expected, some Psychic Power reworking on a large number of armies. Space Wolves lose their powers entirely, and their runic weapons only give +1 to DTW, now (correct me if I'm wrong--that's the thing that allowed 4+ DTW in 24", right?). Blood Angels also lose their powers.
Apparently the listing of psychic powers available to different armies in the rulebook isn't quite accurate, since a unit is still limited to the options available in their codex. These FAQs have gone through and added Daemonology to most things an given older Marine Dexes an exact listing of which disciplines they can use, but I'm seeing nothing allowing CSM psykers to, say, take divination. Looks like Balestar of Mamon is still worth using...