Is G.R.R. Martin Finished 'A Dance With Dragons'?

Many people are reporting today that George Martin is finished A Dance With Dragons the fifth installment of his wonderful Song of Ice and Fire series.

Over on G.R.R. Martin's (Not A) Blog there's a photo of King Kong laying flat out, dead; and Martin's mood is described as 'exhausted'.  The comment thread is filling up with people congratulating him, and Martin has not stepped in to stop them, so it looks like he might actually be done.

I can't wait to catch up with Arya :)