so far? nada
There's a few bits and bobs that you probably won't come across. IMHO there should be more decroative stuff, base salvage was fine as it was, base repricing is a good change, but tbh I could say base > invention salvage was a case of "if it ain't broke, fix it till it is, then fix it again". But anyway if I discuss it more it will probably turn into a flame war...
HOPEFULLY bases will get more love than we've seen here in I13.
Well prior to issue 13 when it was dubbed something like "all your bases belong to us" ..
Nothing has been confirmed, but I hope future issues will attend to that.
More decorative items (also already in-game items)
But I believe future issues will deal with this. After all it took some time until Villains got their Veats.. next would be bases 
Lady Arete on Unionhandbook
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I have missed a lot of the info re. I13 (I don't like to spoil the surprise :P), but I was wondering if anyone had heard if I13 would bring anything to bases other than a recosting of rooms and items etc.