Mike,
Yea, 4.5.3 should just be bug fixes and will be relatively easy to upgrade, but I have a sneaking suspicion that I will finish and then have the release happen the next day.
Looking at the news posting in this sub-forum has me thinking that the release schedule is close to the end of the month.
04-26-2012 4.5.0
06-26-2012 4.5.1
07-25-2012 4.5.2
If I am not mistaken, 09-25-2012 or 09-26-2012 seem like highly probable dates for the release. Then again, it could be October.