7 Months Ago, Home Cinema Choice says (in Sony confirms UMD-free 'test' for PSP)  UK
SCEA has confirmed that the critically acclaimed PSP game Patapon 2 will not be released on its proprietary UMD-disc format in the US, instead being released as a digital download only. Gamers who wish to buy Patapon 2 at retail will purchase a box ...

And 1UP.com says (in Sony Confirms Patapon 2 is a "Test Case" For Digital Content)  NY
Don't expect a UMD to drop out of your Patapon 2 box when picking it up on May 5. By Chris Pereira, 04/13/2009 The News: After reports earlier today that the upcoming PSP game Patapon 2 would be selling at retail with a download code in place of an ...