This is the response I received when I emailed them with that same question.
I am responding to your inquiry into the security CBAI in your account.
Currently, the pre-split shares of CBAI# are still showing in your account ending in ********. We have not yet received the post split shares as of 6/21/2011. Once we receive the new shares they will immediately be deposited into your account. We do not have any anticipated pay date as of yet.
Please let us know if you have any further questions. Thank you for choosing Scottrade.