I'm also really curious about this, but honestly, it's almost impossible to succeed... the expectations are even higher than Diablo 3, and the resposibility as well. It will probably fail even more than D3 and perhaps end this boring "everything is MMO" era...
WoW originally launched mostly riding on W3 fame and Blizzard's name, it wasn't the perfect launch of the best game ever, but they were smart enought to quickly copy every new feature other MMOs created. Titan will have to be released "almost perfect", people will be expecting it to play as smoothly as wow does after 8 years of pacthes, and to implement every great new ideia MMOs had...
I'm especially curious on how it will handle combat... the wow model is terribly outdated. I would instantly be hyped for this if they were going for a TERA-like approach, but I doubt it will be more than a Guild Wars clone... Blizzard never was a original company, just great at copying other stuff and making it look like it's theirs.
The setting is the other big question, Wow used all of W3's hype and was almost a sequel to it, you would see Thrall at Ogrimmar, the monument to Hellscrean's death, and latter even fight Arthas, Illidan and Deathwing... now that the whole Warcraft 2-3 lore is explored, Blizzard gives us filler stuff like pandas; and that already doesn't have the same impact as previous ones... Titan just doesn't have any lore to ride on anymore, unless it uses Starcraft's universe (and is released after the three SC2 games), they just won't have any "famous" names to drawn old players into it...