According to an interview at the French website Jeux Video, (see the first alternative source below,) the producer of Ace Combat 6 has revealed the possibility of a PS3 version of the air simulation game.
In addition, earlier the official site for Beautiful Katamari listed PlayStation 3 and Wii versions as "TBD" ("To Be Determined,") The website has since then been updated, and the PS3 and Wii listing removed after being spotted and reported.
In a similar fashion, Eternal Sonata (aka Trusty Bell in Japan) is also listed as "TBD" for PlayStation 3 -- but interestingly, no Wii. The unintentional listing has also been discovered and removed.
Altogether which seem to be an interesting coincidence. 1UP speculates that Beautiful Katamari and Eternal Sonata will be announced at the upcoming Tokyo Game Show (TGS) 2007, (i.e., the second alternative source below.)
Note: Snapshots of the evidences were taken by Kotaku before the websites changes and are attached below.