BES 5.0 has been out for a couple days now, bringing along with it centralized management over applications allowed and disallowed, high-availability(allowing it to fail over to a stand by server), remote file access, enhanced calendar functionality. and a few new features that you can check out here.
On another note Google is set to bolster its support of the blackberry phones.
I have one last rumor to spread. Apparently BlackBerry phones(not sure which ones, im guessing the 8830 or 8900 and up) will be able to print natively utilizing BES. Once I hear more ill be sure to post.