Remember DLForward zoning changes are meant to cover the next 40 years. So yeah it could be in the 2030s or beyond before we see Simba and other plots of land covered under DLForward being used. That doesn't mean it won't be that long before we see Avatar, Coco, etc.
This is why this idea that Simba is immediately going to be used for Avatar, or Coco, or some other project is probably not a reality. Could it happen quickly, sure because they can start developing that land anytime. But is it more probable they use existing plot of land within the existing Parks footprints first, yeah I think that is more likely.
Which means the likely scenario is
Avatar - Backlot/Transportation Hub
Coco - Pier spot behind Incredicoaster/TSMM
Avengers 2 attractions - Already known and confirmed spot behind MB.
As for what goes first for DLForward, honestly given so much focus on DCA right now I would suspect DL gets its expansion first.