What things you are most excited about doing in New vegas? Gambling? Role playing? The story? ect
Probably the New Vegas GECK, and the extras that come with the CE. It really depends exactly on what they have done different (which gameplay-wise, supposedly isn't that much).
I'm very interested in seeing how the game tracks and reacts to the player, and I will probably like the main story as it unfolds.
**First time, I almost always play to break the game. I always fall through the floors and or get stuck in places (not just in Bethesda games, but very often in FO3 and Oblivion).