If this isn't one of the best-selling games come the end of this year, I'll be very surprised...
Scheduled for a Japanese launch on January 31st and a North American launch on March 9th (European and Australian dates are still to be announced as I write this), this third game in the hugely popular "Super Smash Bros." series will be the first to feature third-party games characters in addition to the usual Nintendo roster. Solid Snake from Konami's ever-popular "Metal Gear" games series will feature, but by far the most eagerly anticipated addition to the list of playable characters in the game is Sega's mascot, Sonic the Hedgehog...
So, at long long last, video game fans will be able to have their very own "Mario vs. Sonic" fights in an official game! Amen to that!
This is only the second official game ever to feature Mario and Sonic together - Mario & Sonic at the Olympic Games of course being the first one - and I think that this game will be much more well-received by critics than was the first joint outing of the two characters. You can visit the official site for the game here.
While you're waiting for this epic game to be released, don't forget that you can have some unofficial Mario vs. Sonic battles in these two brilliant fan-produced Flash online games:
Super Smash Brothers: Super Smash Flash
Sonic the Hedgehog: Ultimate Robotnik Duels