A CMS is a very obvious expansion point, so it will be something we'll be looking at down the line. It's also something that needs a lot of info from (potential) users. I don't think there's any type of software that means as many different things to different people. It's very important to get the CMS right.
Can you give a estimate on time frames for this? I'm thinking of changing from vbulletin to IPB but may hold off and stick with vbulletin for the time being and then move to xenforo instead but it would need a cms before I could make that move, and when you were with vbulletin a CMS was promised for 8 years and I wouldn't be prepared to wait that long.