From the latest Lying In the Gutters rumor column, here's a little more detail/speculation on Joss taking over The New X-Men
The delay signing up Joss Whedon has had an impact on the scheduling of the line. Well, I understand there will be a 12 month gap between Grant Morrison leaving the book and John Cassaday and Joss Whedon coming on board. The artist for that interim period will be Salvador LaRocca and... well... I'm told Neil Gaiman for six months and Pete Milligan for another six.
Except, you see, Neil Gaiman denies he's agreed to anything like this, although he has heard this very same twist on the old rumour very recently. The problem is that we've both been hearing it from people who should be in a position to know. Wishful thinking on Marvel's part? A false leak intended to trap the unwary?
Gaiman tells me he'd be too busy anyway, and while he has another comic project planned for Marvel after "1602," it will be in the future. Like, quite a way away. A bit like Sydney in that respect.
However, whoever's on the book, it looks like X-Men fans may have a little longer to wait for Joss Whedon than they may have been expecting.