I honestly doubt there will be any changes for 2012. You might get some of the small fixes here and there, that anyone with a 2011 who brings it in for a defect will get the same 'updated' item.
Sometimes they change a few things the year prior to the mid-life refresh, but that'll probably be 2013.
As far as criticism, well the Acura RL has been relatively un-changed for many years, eventhough several of the magazines I looked at is saying that it's completly insignificant in its market. Honda has done a pretty good job at ignoring those complaints in my opinion.
I'm sure honda expected criticism for not putting the 6spd on all models, but they did it anyways.
Anyways, here are some examples off the top of my head:
3G Acura TL 04-05 no change, 06 improved HFL with phonebook sync. 07-08; mid life update, new wheels on base model, softer suspension, cosmetic dash changes red/clear tail lights, significant transmission changes due to complains with automatic failures, and a few other things. Plus the introduction of the TypeS model and a revised 3rd gear linkage and stronger synchros for 1st and 2nd gear.
4G TL started in 09. not much changed other than the addition of a 6spd in 2010.
now for 2012 they changed the face and rear and a few other cosmetics, Finally it has the 6spd automatic, and also added an advanced package.
So taking that and applying it to the odyssey, I just forsee some minor tweaks until the mid-life refresh. Then, they might offer a Odyssey Type R Advanced package SH-AWD... who knows, but come join me in my speculation.
anyways, back to reality, as some have said, the wait time can be fairly long. We put the deposit down october 1st and received our van Dec 3rd. Some have waited longer. If my memory serves me right though, the wait seems longer on Touring and Touring Elite models.
hope this helps