I got the game today
will point out a few things which have been falsy said by people who "reviewed" the E3 version
-Every song is remixed on here, It also features a few new tracks...most remixes are techno or jazz.... Sadly no Speed trance remixes
-Bowser can now break dance (looks cool)
-Story mode lasts about 1hour, which is pretty good for a dancing game
-Features a Jpop song in English, a Mario remix features a reggae guy singing in japanese, commentator is the ddr guy and perfects/goods are japanese
-Heavy is heavy, standard seems to get to about 5-6 foot (dr mario remix)
-Toad is annoying, and guides you thu story mode.
-Not baised on sunshine like other spin-off games but features a the octopus from sunshine.
-Mini games are fun but much like donkey konga ones, you will play them a few times and then not touch them again
-Stages are interactive with your dancing (example. if you miss a step while mario is controlling the ship, then the ship/screen will shake)
-you can turn off items when choosing the stage, most items are annoying... most fun is proberly the rocket ship
edit: The matt is pretty good too, I played it on a wood floor, and the only real time it moved/slipped was when I tried the heavys
only thing I didnt like was the foot area's arnt very large, I often missed the Down arror when I stepped back