Always "fun" to get major upgrades to a couple of workhorse programs. SX2 addresses some of the petty annoyances of SX1, and seems stable so far. The folder tracks paradigm for dealing with automation and such really seems to work.
Kontakt's main new attraction is the 'Beat Machine' which is essentially Recycle integrated into Kontakt. It takes a minute to figure out (hint: slicing mode is different than regular keymapping mode) but it's easy to load up a chunk of audio, slice it and assign slices to note numbers. They also fully support VST automation now, which dovetails nicely with the nicer automation implentation in SX.
I don't really know what the difference is between Intakt and Kontakt's beat machine mode, because they look very similar.
What it comes down to is that the market for hardware samplers is going to shrink drastically, except for things like the MPC2000/4000/1000 sequencer/sampler thingers. I really want one of the MPC1K machines. They're the right form factor -- about the size of a laptop -- and Akai stuff has always seemed easy for me to learn how to operate. What you give up relative to the MPC2000 seems to be hard disks (smartmedia cards only) and the 8 output option. What you gain is a device that could go in carry on luggage; I could fit the MPC1K and my laptop in my MAudio backpack... and the MPC1K hooks up via USB so you can use your computer to drag&drop audio into kits...