Is already known how many games are to be expected for "Rose Guns"? It isn't part of the "When They Cry" series, is it? However, the release structure (including previous chapters seems to be like that series, in contrast to Higanbana).
Btw. I just noticed (not really that important but I thought I would mention it) but shouldn't the news date at the following page for the Rose Guns Demo be in 2012:
http://witch-hunt.com/news.html