Canon will eventually release it and it will sell like hotcakes.By this point, I somehow doubt that. Yn will have their clone 600ex flashes out by then...
While I don't own 430EXII, preferring my pair of 580EXII for greater output and facility for an external power source, I see the 430EXII as an ideal flash for most people with relatively modest needs. Which is most people. Not anyone at CR of course! It's small, light, reliable and less expensive, with the cache of perceived
Genuine Canon seal of quality.
The reality is that the greatest majority of Canon shooters will have never heard of Yongnuo, let alone trust a non-Canon product. Those "in the know"
will see no issues with a Yongnuo purchase and probably do so with a practical knowledge of any genuine shortcomings (if any) compared to the Canon original.
The current 430EXII will continue to sell in large numbers probably for years, I suspect it outsells the 600EX-RT. A 430 EX-RT would certainly be a successful product for Canon, but I wouldn't be holding my breath waiting for an announcement.