Not true DJMadCow.
Tank said the Furnace is one of the last large maps coming.
He didn't say the Furnace IS the last large map.
True, the way he phrased was "maybe/perhaps" not that it was indeed the last one. I'm hoping there are more large ones to come... eventually.
Gypsy's response made it seem like it's also not a definite thing either... anything could happen... just have to wait and see what the future brings.