In terms of the Cairngorm Loop, the bothy in Feshie still looks very unfinished and I can't see it being open for your passing.
Feshie Estate have done a little path re-routing where it had been damaged by the river, with the risk of a loooong drop. Smaller bit of path are still affected tough so be very careful if it's dark or you could get wet.
The steps at the big landslip in Feshie still end several feet above the river so some manhandling will be required. It'll be slightly easier if there are a couple of you.
As a general point, the "official" CL route along Feshie is now wrong in several places so don't try to stick to the GPX track, follow what's on the ground.