Some interesting info went up on GameFAQs recently. A user by the name of Asho posted a link to a
2Chan thread. This discussion topic started with an Ouendan/EBA FAQ, and went into Ouendan 2 (Apparently, quite a few stores in Japan broke the release date). At the end of the FAQ, the user posted an Ouendan 2 song list, which seems to include the 3 remaining songs. If this topic is to be believed, then the only songs left to reveal are:
族 (Zoku) - Kishidan
Samurai Blue - ZZ -
Youtube
COUNTDOWN - hyde -
Youtube
But as Asho pointed out, these songs should still be under scrutiny since there's been no official confirmation.
As for the replies in the 2ch topic, they provide some interesting information about EBA features that are returning in this sequel:
-Easier to recover from mistakes
-Intro Skip
-Ghost Vs. (And I'm assuming that replay save is included with this)
-DS Download Play (Though not many details were given)
The topic also has quite a bit of fluff (Monkey Magic? Monkeys are cute!; Ouendan 3 should be a anime/tv show compilation!). Though, there's still something that bothers me... but I'll check it out later.