I have it and, apart from under the hood changes (it's definitely snappier), there really isn't much difference.
Shake Reduction filter? Hasn't amazed me so far.
The rest? nothing special to report.
The UI is identical to CS6.
Basically, the reason they don't want to sell this in a box for a lump sum, is that there really isn't enough there to justify it.
It's CS6 with a boost and a couple of new filters.
Buy CS6 and live happily ever after.