Changes that are available in both 6 and CC include:

• a redesigned streamlined import process, intended to make importing more straightforward for newer users
• improved blending and alignment of panorama and HDR merges
• support for new cameras
• tether support for the Leica M Monochrome
• new lens profiles
• bug fixes

In addition, for CC subscribers only, De-haze is now available as a local adjustment, in the adjustment brush, graduated filter, and radial filter tools.

What was Adobe thinking?  The new import process looks more modern and is designed to be easier for non-pros but looses some of it's features.  Additionally, it causes a performance hit because it's always looking for new image folders to import.  Luckily this can be turned off in the preferences, by un-checking "add photos".  There are even rumors that it's causing Macs to crash.  This may turn out to be a good update in the end, but I would wait for now until they figure out all the bugs.  You can see the full update information here.