My guess is that the reason we haven't seen a lot of updates to Media Pro lately is that they're busy integrating it into C1! If that IS what they're doing, when they finish, C1 will have the best cataloging system in the business.
I
really hope this is true. The poor cataloging system is my primary gripe with C1 and the main reason I stick with LR. I've kept updating C1, which is starting to get expensive - I just updated to v8 on 10/23/15 - a little outside the free update window.
So I'll probably have to wait for a while before upgrading to v9. I can at least experiment with the trial, in the meantime.
One day, maybe v11, maybe v12, I'd be able to switch to C1 full time. As an old Aperture user, I like the interface better. But continue to hope Phase One will ditch to collections and follow Aperture's lead on cataloging a little more closely.