ULTRAMIX 3: http://www.gamepro.com/microsoft/xbox/21899/info.shtml

UM3 Highlights:
-UM1 AND UM2 songpacks are usable in UM3
-Freestyle Mode: Beginning players can dance as they like while experienced people can earn a high score
-Quest Mode: Go from city to city and create your own troupe of professional dancers! Challenging Songs and Routines are there in that 4-panel road...
-Jukebox Mode: Self-explanatory.
-Other staple modes.

DDR EXTREME 2: http://www.gamepro.com/sony/ps2/21897/info.shtml

EXTREME 2 Highlights:
-THANK JEBUS ALMIGHTY, ONLINE GAMEPLAY AT LAST. With internet rankings!
-U.S. Licenses include Genie in a Bottle and Oops! I Did It Again (probably Karaoke Revolution transplants)
-Other staple modes.

Your Ultramix 3 link is broken... I think GamePro took the profile down for whatever reason.

Because they're wussy dumbasses to the nth power who hide behind stupid cartoon avatars and spoiled almost everything before E3.

I'm so glad that they are coming out with a sequel for US Extreme. It better be better than the first. And I also can't believe that Ultramix 3 is having a Freestyle Mode! I remember all the time I always thought to myself, "There should be a Freestyle Mode on DDR", and here it is! But I just can't wait for them to come out.