From the Pri-Med conference, the understanding I got is that 6.5 is the planned immediate release to get the non-PM upgrades to us first while they continue to tweak the PM stuff for the planned 7.0 release. So with 6.5, the interface hub should come out with the letter writer and the other smaller fixes that they have worked on. Hopefully that sheds a little light from what I recall from the info dispensed at the last gathering.
