Seems a lot of people are having troubles upgrading to MovableType Version 3.2, and I must admit when I went to read the upgrade instructions I was totally confused. I have yet to find the page that talks about what changes need to be made to templates.
Being I have a very customized site, I have concluded I am going to have to setup a test site to do the upgrade on. If you read the SixApart user forums their are a lot of people asking for help on various issues, and it looks like users are helping users and their is very few staff replies to problems.
When I see messages that indicate all comments and category information are being deleted not mention hung upgrades I wonder if SixApart attempt to automate upgrades is not as slick as they are advertising.
My advice is to sit on the fence a few days as I am sure their will be some updates coming soon.