The 536 has two upgrades available:
1) Provoice is used by a few public agencies as it was an alternative to p25. It's out there, but It depends on where you live if this is interesting to you. There is no Provoice within 100 miles of where I live.
2) DMR is Motorola's digital format. It's used by a lot of public agencies and a bunch of the older DMR gear is being used to build ham radio repeaters.
The 436 and 563 do not know how to decode dstar, but it might be possible for Uniden to release an update that adds this since the voice format is very similar to DMR. I really hope they do release this as their next update