Himwari
Love Shine
Freedom
Under the Sky
Graduation
Candy <3
Love Love Sugar

These songs have been confirmed as unlockable revivals in X2 AC, most of them having picture evidence.  The game isn't 00% unlocked either, so there could still be more!

However, the true... songs and Dive to the Night don't seem to be there...  Maybe they need to be unlocked for some weird reason.

Another DDR with amazing songs I'll never get to play. Wonderful.

That's great! X2 sounds way awesome (for this and for a certain other song), I hope it comes to an arcade near me eventually. ;-;

YES!!!  Hopefull it'll be better than X (considering how much of a disaster that was, it wouldn't be hard...)

I don't know if this counts but...

There is also "Shining".

http://www.youtube.com/watch?v=tSV55CS0YMQ

Oh, it defintley counts 

I really like the Shining remake.  Much better than the English versions of Love Shine and the others from Hottest Party (Although the Freedom remake in Furu Furu Party was cool)

Under the Sky, Himawari, and Love Shine were just revived in Resort Anthem now!

Hopefully Toon Street and V8/XG2 revive them as well!

Maybe this is good sign in where - Riyu at least - might be heading. Although probably just a pipe dream.