lots of assets in this map are unreleased right now - we're all (aka the people working on this) working on refining the textures and getting them to a point where we'd consider them ready for release. the wet floor sign is one of them, although we might be able to give that an early release since it's Pretty Damn Cool.
b4nny really liked the map from what I saw - as well as other important tf2 comp players like Sideshow - they've been pugging it, giving feedback, great things. I think it was received rather warmly.
B1A has also been added to the official rotation of popular pugging service PugChamp - alongside the 7 main maps in ESEA. So far it's the only map not in ESEA rotation that is on the pug list. Great stuff, lots of feedback coming from there.