Well since it's Castlevania related and Konami will be actively involved at a gamescom event:
Wednesday, August 17 at 9:00am - August 21 at 6:00pm
Konami Booth B31 in Hall 7.1 – gamescom 2011, Cologne, Germanyhttp://www.facebook.com/event.php?eid=172191792852983
It looks like Castlevania HD might release on PSN a little later than expected (but still this season! In Japan, Summer lasts until August and Autumn starts in Sept., so it might still be released like the last week of August, or perhaps delayed a few extra weeks.) and who knows what surprises they might have at Gamescom as well, might be 1999 related.
Since Konami would invest in presenting Castlevania HD at gamescom, that might be first glimpse of the local co-op mode, and maybe help boost promoting Castlevania HD further before release (and maybe some Castlevania sneak peek.) Also it's possible interviews might leak new info about future plans.