They never said it would be monthly until just now.
I'm allowed to be cynical when it comes to release dates.
There's not going to be MM6 or X3 for the Wii VC going by the "One release a MONTH and lately its been nothing but Neo-Geo games because Nintendo doesn't know how to properly plan a release schedule".
When was that second Code Geass OVA supposed to hit Theaters? Three Months after the first one (October 2012)? When's it currently planned for? July, a whole [tornado fang]ing year later. Don't even get me started on Rebuild of Evangelion's Development Hell, the second came two years late, the third just came out four months ago, and we don't even know when we're getting the LAST one, probably after Third Impact so the whole series will effectively take place in the past by the time they're done.