I doubt it, I agree with Acegikmo, it looks a bit rough for something Valve would put out (on-purpose ). It probably was a prototype sky for an entirely new TF2 map that Valve forgot to remove from the gcf.
You're probably right. I also had another look at arena_well, and although the lighting's changed a lot from well, it's now setup more to be dawn than the dusk of this skybox.
Well why not decompile arena_well and find out how it looks with the new skybox?
Done it, the skybox sort of works with the map, although the moon is a bit pixelated and the middle building is too bright (although it is right under the moon). You can tell it's a quick compile, you can still see the areaportals xD
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