I don't have this confirmed yet but I have two things for Animal Kingdom.
1. Disney is working on getting some new tigers for the jungle trek. Two tigers died a couple of years ago and four are left at the ages of 16 and won't be along for a lot longer. Disney is looking into getting two male tigers and one female tiger. Rumors are the female is already at AK.
2. Kilimanjaro safaris is testing new trucks that will be phased in the next year or so. These new trucks will just have some cosmetic differences to the guests but will include some more a amenities for the driver. It's also said the new trucks may be a little less bumpy than the previous ones but will not take away from the authenticity or real ness of the safari. No word on when all of the trucks will be phased in. I read that Ford made the last trucks so they may be doing these as well.