Here are my thoughts, based on Cory's hint (thanks for dropping in!)

Avengers: possible
FF: possible
Cap: possible
Thor Next volume has already been solicited; increased frequency unlikely
Hulk Next volume has already been solicited; increased frequency unlikely
Defenders: possible (my bet)
MTIO   The next volume will contain issue #21, with a Doc Savage appearance.
Sub-Mariner Next volume's not due this soon
Ant Man: Possible, but I'd be surprised
Captain Marvel Next volume's not due this soon
Ms. Marvel Volume 1 is still pending; unlikely to follow up with vol. 2 without sales figures for vol. 1

Atlas Strange Tales: Along with Venus or Journey Into Mystery, another good possibility for an Atlas volume (if any are forthcoming)
Atlas Jungle Adventures It's been so long since an Atlas volume that I'd be surprised to see a follow-up to the last volume, which IIRC had weak numbers

GA Marvel Mystery Comics: I think it'll be a while - if ever - until we see the next volume
GA Cap: The best bet, I think, for another Golden Age title
GA Subby Another dead line, at least for the foreseeable future
GA Human Torch Another dead line, at least for the foreseeable future
GA Rarities: A wild card... possible, especially for an anniversary year