I heard an interesting thing. They're talking about listing some of the half-critters in the main book. So you'd have half-dragons and half-genies and whatnot presumably.
This brings up something I've always wanted to see in a game. Half-races as templates. The half-elf and half-orc have always been assumed to be human crosses, but that's just weird. Then again, trying to make them into anything else just gets really fuzzy rules wise. A simple fix would be to make a template for each one that you could then stick onto any character at chargen--just like all the other heritage templates.
For one, it simplifies things. Everything goes off the same mechanics. Now you don't have one kind of writeup for a PC whose parent is a troll or a minotaur and a whole different kind of writeup for a character whose parent is an orc.
It's also powerful. You get to qualify what can mate with what (for example if you want to axe the half-elven dwarf you can, or establish what strange effects that would have--like sterility for example, or as is the case with races like minotaurs and halflings you could put a size requirement in--characters of large size cannot be half-halfling.) You don't need a new race writeup for every race-race combination either. Once you have the half-elf you can apply that to anything that applies.
Anyway it's just a thought. It's nice because it wouldn't really change anything in setting. It's just a nice organizational tweak to get the rules working in a more seamless, less clunky way.