Looks like the new chip will get a small speed bump and the GPU will be based on Radeon 8xxx instead of 7xxx. But it is listed as still using FM2 socket so current 2nd gen APU users can upgrade to it (in theory).
http://www.cpu-world.com/Compare/472/AMD_A10-Series_A10-5800K_vs_AMD_A10-Series_A10-6800K.html
http://www.cpu-world.com/Compare/472/AMD_A10-Series_A10-5800K_vs_AMD_A10-Series_A10-6800K.html