You'll receive a confirmation email for approval or rejection of
whitelisting, and an email for approval of a source parameter. You
can tell you've been whitelisted programmatically by looking at the
/account/rate_limit_status method.
OAuth is still heading towards a beta, and that will be announced.
Likewise with the firehose.
--
Alex Payne - API Lead, Twitter, Inc.
http://twitter.com/al3x