Originally Posted by knc1
Sorry, My Bad, I was getting the update numbers confused.
(And I wrote up the firmware <-> model list.)
But I wasn't 100% wrong - if the device updates to 5.3.3 it will not be possible to jailbreak it without reloading 5.3.1 (or earlier).
So the O.P.'s answer is: Jailbreak it **NOW** before any upgrade.
Sorry, I thought it was obvious from my post that I had jailbroken it already to get collections manager working again. I've had it in airplane mode for months now, so I really am at 5.3.0.
I was mostly asking if there were any good features in 5.3.3 that I would want. I should have just googled for a feature list. Sorry for the confusion.