The Undertree????

Yeh, i've noticed that also since about a month now and i pretty much talked with everyone about it in-game and we all think it's gonna be most likely the new Map which comes on Halloween. Also i feel it's quite fitting since i've heard it is most likely similiar to a dark and..i dunno swampy/forest area? i haz no idea, but sure is fitting to Halloween!
I guess the reason why it's allready started to be implented is to test it ouf ingame allready if everything works so that once it is officially released, there won't come any problems up.

Tho i guess the biggest secret will be: Where will it's entrence be? Will it be connected with Miso? WIth the Caverns of Order (Canis Side)? Tunnel Beta????

I sorta suspect Miso for it. It also would probably fit since Miso is allready sorta dull and that when you go deeper, that it also gets probably darker. But welp..it's just suspisions, me no know really lol. All i just know is that i'm hyped and i wanna see it and especially where the entrence is!(and i hope the map will be stable, not that it crashes just because like 5 people are on it xD)

mysterious 

i didn't realize that the undertree showed up on the map list until it was too late waowfrfrwaow
it's not in the current update, but it will be in the next one.

i think future maps i'm testing are probably going to end up on the list too now

You aren't suposed to tell them that!

Well you know there might, maybe, posibly be a leaked screenshot somewhere on the form. Can't say more than that though.