By the looks of it, very minor upgrades. They launched another unit altogether the DR70D which looks like a beefier unit and more sensible upgrade, if you really felt it would address a specific complaint. There are always mk2s. Planned obselesance and all that.
My mk1 is working well. I had messed around with zooms and beachteks and never quite happy, apart from the battery issue, the mk1 is great, so I go with Murphy's law...
EOS 3, 7D, 60D, 20D, M, 300x, Arsat 80mm TS, Samyangs f1.4 35 & 85, m22 f2.0, m18-55, 100 2.0, 70-200 2.8L, Sigma 18-50 2.8, 50mm f1.4, 70mm f2.8, Tokina 11-16 2.8, 400 5.6 and lots and lots of grip, lights, sound gear.