6 Months Ago, 1UP.com says (in Burnout Cops and Robbers and New Killzone 2 Maps Released on ...) PSP owners also get a demo this week in Patapon 2. Those willing to part with a few dollars for some downloadable content will find plenty more of interest. The Killzone 2 Steel & Titanium map pack ($6) adds two new maps to the game's multiplayer mode; ...

7 Months Ago, Gamers.com says (in Sony Confirms Patapon 2 is a “Test Case” For Digital Content) Don't expect a UMD to drop out of your Patapon 2 box when picking it up on May 5. 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 actual UMD in the box, ...

And Tech.co.uk 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 ...