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I dont like using extents purely from a management point of view. Its too easy to forget that 2 LUNs are making up a single VMFS. Remember if you lose a LUN for whatever reason you lose the entire datastore. Usually losing a LUN is purely from somebody deleting it accidentally. If you plan the LUN design well enough there's rarely any reason to create extents, particularly now we have Storage Vmotion to live migrate Virtual mchine files around between datastores without service interruption.
On the MSA side of things, I think the 2012 is the same as an MSA 2000 - I think its just product terminology but I'm not sure, as far as I am concerned it is the same product, it behaves in the same way.
On the MSA2000 a vDisk refers to groups of disks which you assign a RAID level to, so no, a single vDisk can only have one RAID setting. The MSA1500 was different in that you create one group of disks and then create LUNs with different RAID groups. The MSA2000 is more like other SANs now.
Yes you can create separate groups of disks (or vDisks) with different RAID settings. For example for dedicated database LUNs you may want Raid10 for logs for sequential writes, and a RAID-5 for random-access data files.