Another cosmetic change I really wish/hope they do is to finally come up with an actual specific race name for the half-elf and the half-orc. They did it for the half-elves in Eberron with the khoravar... but I'd love both of these races to have generic world names as well. Especially considering the idea that many HE/HOs are now ancestrally "true blooded" races (IE rather than being the progeny of an elf and a human, you are the progeny of a half-elf and half-elf).
And its not even without precedent... since the human/dwarf hybrid is called the mul, and that's a name that I would imagine gets used by players to identify the race even in a world outside of Dark Sun. And they went ahead and renamed the ogre mage the oni, seeing as how they realized it was an actual different humanoid race and not an actual ogre who just used magic.
So come up with a good name for these two races that can be used side-by-side with 'half-elf' and 'half-orc'. That way both sides of the opinion can have something they like and can justify making a semblance of sense.