That's the MMPD release I believe. Try the link in the op for a better cover and trade release.
Also this might clear it up: http://www.thepassivevoice.com/04/2013/trade-versus-mass-market-oh-the-humanity/
The difference is actually the Publishers the one already available is by Gollancz and is the UK Version. The other version is published by Orbit and is the US version (these are the ones I own). I'm fairly certain the cover is not the only difference but having not had a chance to read the UK release I can't tell you what if any differences there are.