Via Warseer's Siam-Tiger
They didn't said anything about september, only said "there will be space wolves in october, with some boxes" and "there will be skaven, but 4 boxes will remain".
For your information those plastic boxes will stay, rat ogres will stay, plague monks will stay, gutterrunners will stay and a forth one i can't remember.
So ladies and gentlemen, if you are thinking about starting a skaven army, buy your forces (the 80 eur boxes with 67+ miniatures) now! The regular skaven warriors will most likely be boxes in size of 10 for about 20 bucks, ergo +50% price raise.