The LCS IM client portion got a wee bit more complicated. They now give you the option of LCS\Windows Messenger, LCS\Office Communicator, and both. However, their wording in the Installation and Upgrade guides for the Office Communicator portion is rather confusing. It's almost as if they are making an assumption that people are using the OCWA portion, which isn't the case in my experience. They 'require' you to have some patches on the LCS servers for some AJAX fix (which is a web scripting technology). Anyhow, word to the wise, if you have LCS, you may not want to install this until further clarification is known.
In the beginning the Universe was created. This has made a lot of people very angry and is widely regarded as a bad move.