The Initiative for me. Their project is rumoured to be very big and just the thought of what they could be making, could it be a new IP like a Tomb Raider style game or could it be a revival of an older IP like Perfect Dark.
Also Worlds Edge, as I love Age of Empires and the 4th game is something I am extremely excited about.
Obsidian, Rare, The Coalition, Ninja Theory, 343, Undead Labs and Playground Games I am all very exciting to see more and hear more of there projects.
InXile, Turn 10, Compulsion Games, Mojang, Double Fine don't really make the type of games I prefer so I am sure they will be exciting for others.