There haven't been too many new franchises announced at this years E3, but Steep is probably the biggest one so far.
Coming from Ubisoft's press conference, it is an online (with a focus on social), open world, extreme winter sports game. The goals, and the gameplay hook seem a bit undefined right now, but if you've every wanted to Ski down sheer cliffs and base jump off mountains, this looks like your jam.
Take a look:
And here is some gameplay:
The game ships in December.