I have pre-ordered it simply because I think AppGameKit is great and I did want to support the development in general, they really did not ask for a lot considering we get the tool to keep forever and free updates for at least 6-12 months I would expect. I was also very interested in the level editor, I can't really say I am impressed, but it is working and it is only an alpha. There is still time to improve it if TGC is listening to our feedbacks and suggestions.
What I am impressed with actually is the debugger, it got some really useful features and the ability to expose variables to the IDE and change values during live preview to fine tune few things.
I am very optimistic about AGKS.
The way I see it, with Studio you get everything the Classic has to offer and more. Told, after the release they also going to add/keep fallback to OpenGL renderer in case you want to support older devices and all platform going to be supported too.