Haven't watched the trailer (I assume it's cinematics and that doesn't interest me), but it'll be nice to have another Fallout game. I enjoyed 3 quite a bit, though I never finished all the quests (and am in a subsequent playthru). The character creator for Fallout 3 (which was the same for Oblivion, which was similar to all the TES character creators) was a bit underwhelming, but then they tend to be.
To me, this just highlights the reason to always play these games on PC: modding. Especially with Bethesda's games, modding allows all kinds of improvements in characters' looks and such, as well as otherwise extending the game. To me, that's the most exciting part about Bethesda's games: the game doesn't end with whatever they sell you. You can mod it out the wazoo.