· 3 Warframes will be available in the next Prime Vault. Frost, Ember and WHO???
Source: https://www.warframe.com/news/devstream-101
The third one might be Loki, but who knows? (I'd like excalibur prime but the odds are very low) .... The unvault happens usually around december 22 when Steam has the Winter Christmas offers.
What about no, low ammo, cold making you slow, mostly you have to jump or be in high places to shoot,and have to worry about the blast damage and close enemies.