So, who would have believed it would actually come out? Who actually knew of the game? I definetly didn't until a few weeks ago.
What is Katawa Shoujo? It's a visual novel, or dating sim, or a bit both. I'm not sure, since I haven't played it yet. So, the basic premise seems to be "take some girls to dates" and so, with a little bit of a twist - each of the girls (as well as protagonist himself) have some disability - some girl has no arms, some has no legs, one is deaf, and the protagonist has suffered a heart attack at a very young age.
Since I can't offer any opinions on the game yet, I'll just direct you to two very different opinions:
John Walker's critical impressions on RockPaperShotgun
A more positive review by Inushinde
You can download the game for free from the Katawa Shoujo homepage.