We'll kick off the show at 18:00 BST on 20 August 2013 with a briefing to media on our release plans for PlayStation 4, as well as updates on PlayStation 3 and PlayStation Vita.
http://uk.playstation.com/ps3/news/.../Join-us-at-gamescom-2013/?WT.mc_id=pdcticker
Make of that what you will I suppose. Also remember...
Release date is being announced next week. It was held because Japan was still being confirmed and they couldn't announce it confidently as early as June. Not to mention various other issues. It has little to do with MS. The release is very soon so MS wouldn't really be able to react regardless, but no specific date could be announced in confidence either a couple months ago.