I have no idea if this will actually be a Mini, so I didn't make a news story. But thought it interesting nonetheless
http://www.andriasang.com/e/blog/2010/03/25/earth_saver_plus/
Tom Create released Earth Saver for DSi Ware in October of last year as a tiny 200 DSi Point download. Now the game is moving on up to PlayStation Network where it will appear as a ¥500 download on April 15.They're charging 2.5 times the amount, but the PSP version, titled Earth Saver Plus, promises seven times the volume.
Anyway, the article has pictures and a description. Seems pretty simple. Even seems to be in English, mostly.
At the very least, seems good news that a Japanese developer is moving on board to make smaller titles like that. Or even just enhanced ports of WiiWare/DSiWare...though $5 seems a little much for it.