ToV never "jumped ship" to the PS3. If you've been paying attention, it's pretty clear that Namco was planning a PS3 release from day one - they just couldn't announce it due to the terms of their contract with Microsoft.
As for everyone saying "what does a Namco release have to do with a Square-Enix release?" What it does is provide yet another example of a Microsoft timed exclusive. This generation, Microsoft appears to have abandoned full exclusivity contracts in favor of timed exclusives. In other words: if it wasn't published by Microsoft and Microsoft doesn't own the IP, it's not a true exclusive.
Star Ocean 4 will be released for the PS3 eventually. The only way it wouldn't be is if Square-Enix thought they'd lose money on the port. If the engine proves too difficult to port to the PS3, I suppose that's possible - but extremely unlikely. Expect to hear an announcement in six to nine months, which will be when that clause of their contract expires.
