A great write-up of all the changes that came with Update 1 to FIM 2010 has been posted to the FIM 2010 Forum.
This will get released as a KB article as well but there has been some issues with it so we went ahead and posted to the Forum to begin with.
ps. I will be posting updates on FIM double for a while as I am restarting my private blog and this will be more just related to FIM. http://blogs.technet.com/bbrekkan : Forefront Identity Manager 2010 – What is new in Update 1