...yes, but it's not a standalone Sega game. There aren't exit polls for this thing, but are people buying it because of Mario, Sonic, or both?
That Sega tennis game's sales will probably be a good point of comparison.
Quite frankly, I *love* that Sega is dusting off the old franchises and aren't milking them by putting them in stupid games (i.e., everything between 2002-2007, it seems).