New Mibba takes a little getting used to, and there may be a few glitches, but I personally think overall that it's been a massive improvement. There was so much that didn't work in the old one.
I think I'm just going to be doing the normal NaNoWriMo.
But I'm not sure, I'll either do it in August or November, I have my story already all planned (in my head) so I could really do either one... I don't know though.