Indeed... now that the storyline seems to be happening, even though I REALLY, as in REALLY, think it's right thing to do, I do think it opens up a bit of a hole in the X-men's lineup in the sense that there is no premiere bad-ass ADULT female asian in their ranks, with any prominence at least.
So... whom shall it be?
Personally, I think I would simply reintroduce Kwannon in the Asian body, with more or less the same outfit, and then have her in X-force as Revanche - basically, we'd get to eat the cake and keep it as well. Kwannon would be more of a sexual presence and a true femme fatale, leading to endless interesting conflicts with her team-mates - basically, like, well, DOMINO, but without the humour.
Oh, btw - this would only concern East Asians and South East Asians, no other asians - so all X-men or mutants with Indian Subcontinent ancestry are obviously exempt, since that's such a different cultural and ethnical group that it's simply damaging to group them together with any of the other Asian groups.
Those groups obviously also need some representation, but that's for another thread.
EDIT:
After feedback, I suppose Jubilee is the most logical, perhaps the only achievable one. A better question then, is this: Whom shall fill the VOID of Asian female representation which Psylocke will leave?