First, I would get rid of the half-elves and the half-orcs. As I mentioned on one of the race survivor threads, the number of inter-race relations required to make each a separate race boggles the mind.
In place of the half-orc, I'll add the original, unadulterated orc.
I'll fill the half-elf slot with the shifter because they have the bestial connection with nature schtick, and that will give me the perfect excuse to get rid of wild elves.
The new race I'll add is the warforged, because of the RP potential of playing a sentient construct.