VentureBeat is reporting that Google's head of special initiatives and wireless, Chris Sacca, is leaving to become an angel investor. Apparently, Sacca has the personal wealth to make this a viable decision.
Sacca was instrumental in leading the 700MHz spectrum charge. There's no named replacement right now. How much impact this will have on Google or its mobile efforts is not clear. However, it will likely have a minimal impact on the consumer facing side of mobile at Google.