If it is not allowed by Apple again, maybe the "clarification" promise of the new App Store rules will officially tell Google what Apple doesn't like. At that point (i assume) Google will do one of the following:
1) Make the requested changes and get it approved.
2) If they don't like the requested changes, they will make a very public post on the Google Public Policy or Voice blog like they did about their complaint to the FCC about the original app rejection (http://googlepublicpolicy.blogspot.com/2009/09/our-complete-...)
Also to note, it is possible that the original Google Voice app submitted last summer would not work with changes Google has made to Voice in the past year. So theoretically now that they know (or found out) that Apple will accept gVoice apps, Google could be working on updates to the app to get it to work before re-submitting it to Apple.
Either way, I think (hope?) that at some point in the near future the official app will come through.
Last week I asked Google if they planned to resubmit/release the official app, and was told that they had nothing to announce at this time.
That being said, I miss support for priority inbox already.