Cant help to much on that one. I would recommend having a test server and testing the upgrade on that. The biggest issue you will come up against is reconfiguring IIS.
IBM just put this out
http://www-01.ibm.com/support/docview.wss?uid=swg22011418&myn...
IBM just put this out
http://www-01.ibm.com/support/docview.wss?uid=swg22011418&myn...