What this demo features is the following:
-New models for the doors
-The first concept of the full release house
-Some small new puzzles
-A decent sized basement with some ideas of how the final release one will be
I dont want to spoil the full release of the mod, but what i can say about it is that the final house will be masive, so expect something big.
Now, about the release date... not sure of it, other than PROBABLY it will be released at the end of the month, but no promises tho.