To the op:
I use the pop-up on my 60D with two 430EXs to control wireless flash all the time, so here is the answer to your question. When your 430EX is mounted in the hot shoe and the flash head is pointed forward (not bounce position!), auto zoom works perfectly (unless you choose to switch it to manual zoom). If your 430EX is in the hot shoe, but you tilt the head upward or to the side for bounce, zoom defaults to 50mm. This is generally a good setting for bounce, and Canon chose wisely. If you use your 430EX wirelessly, the zoom defaults to 24mm. This is very convenient, as I generally put a softbox on the 430EX when using it wirelessly, and 24mm is ideal for that. In these last two cases, the camera cannot know how far the light is traveling to the subject, so auto zoom makes no sense. In any case, you can manually zoom to whatever focal length you want.
When the 430EX or 430EX II is used wirelessly, the following features are not available:
Auto Zoom as discussed above
Second curtain sync is lost.
High Speed sync is lost.
If you want either HS sync or 2nd curtain, the 430EX must be on camera or connected with the camera by an ETTL cable.
Finally, as drmaxx has said, ETTL works perfectly with off camera wireless flash controlled by the pop-up. I use it all the time.
Hope this helps.