The Raspberry Pi foundation has made it relatively clear that they want their forums to provide the majority of support for Raspberry Pi Q&A and discussion. A key player in promotion for this site is the foundation themselves. While it isn't necessary to gain their endorsement, it would definitely help. Are there any specific contacts or players we should reach out to or any strategies we could use to gain their support.
There is a thread here on the RaspPi forum mentioning this SE site: http://www.raspberrypi.org/phpBB3/viewtopic.php?f=57&t=6223
In the meantime I'd suggest the best thing we can do to support the RaspPi foundation and attract their attention is to add as much value to this SE site as we can. Not stepping on the toes of the forum is a good way to do this. That way both can happily co-exist and support the RaspPi community by generating a new resource rather than spreading the same functionality across multiple locations.
Also see: Stack Exchange site vs. forum