Upgrading From Ultegra 6600 to 6800 Help My Ultegra 6600 shifters need replacing. My thought was to replace it with a new 5-piece 6800 set including shifters, front derailleur, rear derailleur SS, an 11-28T cassette and obviously a new chain. 

Can I keep my current compact front crank set? I just replaced the bottom bracket. 
Will the 6600 brakes work with the 6800 shifters?
The crank end generally is fine. Pre- and post-super SLR brakes and levers don't work together because they changed the cable pull. Presuming you have a 10-speed rear wheel, it can't take an 11-speed road cassette.