http://www.antipope.org/charlie/blog-static/2012/10/still-un... mentions "Neptune's Brood", space-opera set 5k years after "Saturn's Children" but it sounds like it may not actually be coming out until next year, along with three volumes of Merchant Princes (the existing books, in omnibus editions with minor changes) and maybe a UK edition of "The rapture of the nerds".
"Neptune's Brood" comes out in July 2013. (It's a high-concept space opera and a meditation on the 2007-08 liquidity crisis. Also, nominally, a sequel to 2008's Hugo-nominated "Saturn's Children".) "The Rhesus Chart" is in the pipeline for July 2014. The other stuff is all, effectively, reprints.
I'm writing #5 right now. Publication due in mid-2014.