I'm already in and posted on this - bonus posts 10-15 days after account open and other language makes me think "105 days before REALLY able to close", but a good place to park ready cash. My gal and I are both going in on this - it will be our short term cash buffer. Joint accounts are ok, but only the primary can get the bonus, so we will wait a while before cross-putting each other as joint on the two accounts. As a little extra juice I used their "refer-a-friend" link for her account to get us each an extra $25.
https://home.capitalone360.com/referafriend?save=d7MX7qQGuY
(use of the above link gets new users AND ME an extra $25, so be aware)