That's really good to know; as you can see from
Headgrinder's A Short Investigation, and the collaborative level
Endless Winter, levels that can be played in
v1.2.1 aswell as in
KS+ are welcome. The general consensus on levels still in development, though, was that they only get added on release.
I was only able to find the
preview thread for
TPoM&tKW at this stage, from which it appears to currently be in Closed Beta. If this is still the case it's a little premature, though the screenshots are looking fantastic and I'll be more than happy to add it as soon as it sees a general release.