There's currently no info on when the games will be available on the North American version of the Playstation network and the title doesn't appear on their list of available games. The game does not appear on the US PSN update blog.
PSP content available to download via PS3 Store
Riff: Everyday Shooter™, £6.29/€7.99
EA Replay, £15.99/€19.99
Tom Clancys Endwar, £34.99/€49.99
The Little Mermaid II, £3.99/€4.99
Disney’s Action Game Feat. Hercules, £3.99/€4.99
Super Pocket Tennis, £7.99/€9.99