RIM buried this under their product documentation site...
BlackBerry Enterprise Server for IBM Lotus Domino Version 4.1 Service Pack 4
Known Issues with IBM Lotus Domino Version 8 and IBM Lotus Notes Version 8 Livelink - Redirection
BES 4.1.4 runs fine, but with issues listed in the release notes above. They will "attempt" to fully support in BES 4.1.5.