Why bother collecting samples for later?
I really don't see the point in collecting rock samples, particularly if they are going to be collected by man later, for return to earth.
Surely any manned mission would include rock coring/sampling gear for subsequent return to earth with the crew (assuming it's not a one way mission!). I see no real reason for Curiosity 2.0 to core the samples years in advance with a difficult, slow, costly automated drill when man will turn up with a slightly less difficult, slow and costly manually operated drill.
I'd like to see the space on the new rover occupied by some other wizz bang kit not storing rock samples.
It's a bit different if they're going to take samples for collection by another robot, but a bit pointless in my opinion if they will be collected by man.