Sort of plus its getting harder and harder to buy 6770 stuff .. I guess they are just calling it back or something. If you update the firmware above 2.6 you cant upgrade to 11sp by just getting the RD; you will also have to get FD (I think you can still use the same shifters, battery etc)
If you get that CAAD10 remember not to upgrade the firmware otherwise no 11 speed upgrade by just changing the RD