The Warforged name is established, so I'd say keep it as primary simply for brand recognition purposes, but honestly, that's a minor issue.
Not noted in the existing 5e tabaxi description(s), but as pointed out earlier in the other Greyhawk thread:
Tabaxi and rakasta were always functionally and thematically the same thing, just added to two different lines of D&D under two different names.
If/when 5e needs to touch on the existence of rakasta, I see no reason they shouldn't just treat it an alternate name for tabaxi.