ZUN wrote on his blog that he will release Touhou 12,
The demo/trial will be out at this Reitaisai (8 march 2009)
Full release will be expected to come out this Summer.
Some other things to mention (you will know this by looking at the screenshot anyway)
1. The independent Bomb System is back (YAY!!)
2. Usable characters are Reimu, Marisa (these two is mandatory), and Sanae
Bad naming scheme, I'd say, and also, there's UFO.......
Well, Name will not justify anything if we say something about Touhou. I'm really looking forward for this game.
Source: ZUN's Blog (Japanese)