This was announced a couple of hours ago on the #IBMConnect site:

Please be advised that if you used the My Schedule page and have already setup your schedule, downloaded the iCal and imported into your calendar, you will want to do that again to get your timezone information correctly imported.
We have made an improvement to the iCal download that we have tested with many calendaring clients that will correctly import the timezone information. When you get to Orlando your devices and normal calendar will adjust properly and have sessions at the correct times!

So if you used the iCal export, looks like you might want to do it again… You don’t want to end up at the wrong session…

See you all in Florida!