Didn't see this anywhere on the forums, but it's a map by JopeZz & thx2Laged. Unfortunately, the beta was unvised and unlit, so I made a lit version of it here:
http://dplogin.com/files/maps/beta/kotth_b1_lit.bspAs I was doing that, I found out ic3y made an altered version as well:
ftp://ic3y.de/pball/maps/beta/kotth_b2.bspNot sure about the visual direction change there.
Pretty fun defending the treehouse:
https://clips.twitch.tv/DaintyBrainyGoshawkCurseLitBiggest problem I see with the map is the spawn camping. I think it would work better if the spawns were spread out more. Getting on the walls seems to be an intentional design, but I'm not sure if it offers anything in the way of objective gameplay. Seemed like it was mostly just frustrating new players who spawned and got shot in the back over and over.
Not sure if the original authors visit the forums or plan to make any future changes, but it would be nice to push this a little further and get it out of beta.