That's the thing; before the trailer, people kept thinking it may have just been the characters showing up and just being all silly like. Of course, that's out the window now.
A lot of us will be disappointed if it doesn't end up being right up there, but then again, some of us didn't really care about the whole 'Touhou becoming an anime' thing.
I however AM looking forward to it, so I can only share the same views. I also kept thinking about if it will be just the one episode or if they might do like a short series. Because if they do, a six episode run would end ON Christmas Day.
Don't listen to me though; I'm just sprouting out all the possibilities I came up with in my head. ^^