"Vector API" is universal api for SIMD. It will probably remain in incubator until valhalla delivers value types.
That being said, the amount of rigor with which the JDK devs test their experiments is really something to witness. Its equivalent to old school MS with painstaking maintenance at backwards compatibility, all the while moving the wheel of progress.
Every single change so far has been planned with a decade of advanced planning because that's just how this ecosystem roles.