the vibration during acceleration has been happening to me too for quite a while. I tried putting high quality gas in for 2 weeks and although it seemed the occurrence was less, it still continued. It seems it's not the gas quality, it must be something else.
I took it to the shop and they're fixing other issues such as my airbag indicator lighting turning off and on, an ignition switch problem and the vibration problem.
For some reason, the mechanics removed my center console and told me that this deployed the airbags.
now they have to talk to the insurance and idk what; it's under warranty though!!!! so many complications and it's a new 2012!!