I imagine that smaller stuff like this will be added towards the end of the games development, or maybe some lesser known writers could submit some stuff like this to get it in sooner, just cause the Big Kahuna's have much more pressing content to get through first
There are actually quite a lot of race checks (pc.ra) in the game right now (just like background and class, or pc.bg and pc.cl). Many of them are relatively hard to notice, because they only alter a line or even a part of a sentence. Wolfram gave a few good examples. I particularly like Cait mistaking the Champion for Calla at gamestart if they're a catfolk. But there are plenty of others, just scattered about. A recent one is that Rift folk combat encounters and interrogations have slightly different text for an elven Champion.
Things like the floofs all having dramatic responses to a kitsune Champion, Hashat's elf obsession, and the orc brawl are obvious, but there are
tiny tweaks hidden all over the game. Are most people gonna notice something like Arona saying "dirty dog...literally!" to a lupine Champion who's had kids with Hretha? No. But it's there.