I believe there was a sticky back when this sub-forum was created in the Alpha-Alpha days. Seems since its gone Beta and now RC that it was removed.
To refresh any new readers, the answer given by the developers state in sum and substance, its ready when its ready.
In regards to the OP's question about ready for production, the following is relevant:http://blog.pfsense.org/?p=585
And to add, the RC1 download link from that blog is the stable one that could be used in production, newer RC1 snapshots are use at your own risk.