Because Capcom have finished Resident Evil 5 including the downloadable content and Resident Evil 5 Gold Edition. They thinking about Developing some new games, this includeds
Resident Evil Revelations - announced at E3 2010
Devil May Cry 5 - will be announced at E3 2011
Lost Planet 3 - In Planning
Dino Crisis 4 - In Planning, and has been announced for 2013 or 2015
so the answer is THERE WILL BE A DEVIL MAY CRY 5 SOON.