From no information, to huge blow outs at the Tokyo Game Show 2008, we got a release window for Europe for both games.
The sequel to the original game for the PSP will be released in Europe in November. That's (wait for it) at least a week before Japan! The new game features slightly fewer levels than the original game, but our bouncing multicoloured friends can now swim and meet more strange creatures. There will also be a few more mini-games, including a multiplayer game where the object is to force your opponents onto the spikes, separating them and eating them. Meanies!
It was slightly less good news for Patapon 2, but the confirmation is still there. Patapon 2: Donchaka will be released early next year (possibly February as a guess). The new game continues in the same fashion as the original and also includes a multiplayer aspect. It looks to revolve around the players teaming up to kill a monster and then to open an egg to claim the prize. Japan will be getting this on November 27th for those keeping up. You can visit the new website - complete with new music - right now which also includes 2 new trailers under the "Special" section.
Update: MCV UK has detailed the release list for Sony in Q4 and LocoRoco 2 will be released on 21st November 2008.
Source: SCEE PressCentre (Loco Roco 2), SCEE PressCentre (Patapon 2), MCV UK