Guys, David Gaider actually answered the question unambiguously.
At the moment i just want to know if some races will be restricted to fewer (or perhaps even none, in a worst case scenario) options than others. Particuarly since gender gating is already in place.
Yes. There is no guarantee that a particular gender/race combination will have as many romantic prospects as another.
And that's fine. Romance options are not candy to be dispensed fairly and evenly, and if there's a particular character that you've decided before the game is released that you must romance, it's advisable you play a different PC. The most we can do (and have done) is ensure that there's no overall slanting towards a particular group-- it's all over the map, for various reasons.
There are race restrictions in the game.
edit: ninja'ed by Ianamus