I can...
No to be too dismissive of MRO but it's not an Imperial class geophysics probe + medium resolution camera like MGS. It'll answer questions by refining the knowledge of regions already imaged, and probably require new questions in doing so.
The geomorph/volatile folks will no doubt love it. In terms of learning things about Mars globally however, it's not going to bring a rennisance like MGS.
I'm holding out for a seismic network before I get too excited.