After all, back in 2005 when A Feast for Crows was split, Martin said that the 1,600 manuscript page mark was a line in the sand that couldn't be crossed, and once it was other plans had to be made. Dragons passed the 1,600 manuscript page mark several weeks ago, leading to fears of a split. Of course, the context is somewhat different: Martin is a much bigger-selling author now (A Song of Ice and Fire has more than doubled its total number of copies sold since 2005) and at the time of Crows's split he still had hundreds more pages to write, whilst with Dragons not much more work remains to be done.
Still, the question was being asked enough for Shawn Speakman of Suvudu and the Terry Brooks website to ask Martin's US editor what the score was. Her reply was pretty clear:
Shawn's Email to Anne, George's Editor:"Hey Anne, has there been any talk of having to split DANCE? Seems like it is getting quite large...? -- S."
From Anne:"No, we cut some stuff back out. Will be about as long as ASOS..."
So that's one possibility laid to rest. A Dance with Dragons will be published in one volume on 12 July. Although I'm sure everyone will be happier once GRRM confirms that the final manuscript has been fully completed and delivered.