I like to play a stealthy character/ranger archetype, so I always pick Wood Elf first, then probably either Dark Elf or Nord, but the Wood Elf is clearly the superior race of Tamriel.
Hopefully the 300 hour quote is a conservative estimate - I was done with Oblivion after 200+ hours, which paled in comparison to the 1000+ hours I spent with Morrowind, but I guess the length of Skyrim, for me at least, depends on how engaging the world is, how unique it's dungeons and ruins are and how much interesting and one-of-a-kind loot there is to discover, all three areas that I felt Oblivion distinctly lacked.
Also, I'm hoping that the game isn't quite obviously designed around fast travel like Oblivion was. I'm fine with having fast travel, magic compasses and map markers for those that want them, but with Oblivion it was as if they hadn't even considered that anyone wouldn't want to play that way. Gone was the sense of adventure and excitement I got from every quest in Morrowind where I would have to make long journeys to reach the destination and use the map, given directions and landmarks to find the place I was looking for. Many found that aspect of Morrowind frustrating, but to me it was equally frustrating to realise that Cyrodil hadn't been designed with walking in mind. Too much open and empty space that felt computer generated where as everything in Vvardenfell felt hand placed.