Haven't been so excited for a game since Street Fighter:AE.
I've been playing Tekken Tag 2 in the arcades in Hong Kong and i must say it's fantastic, there is so much to learn, character specific tag moves, juggles, ect... can't wait to explore it more in the lab on console release.
The roster is the biggest too which gives you so much diversity, it has all the classics and more. Just hope the online is better than the previous Tekken 6 installment seeing as that let the console release down.
The graphics are pretty much like Tekken 6 standard, perhaps a little higher. Overall, i'd say this game is a great investment.