I have searched the specs on Dell's site and couldn't see confirmation of this, but the SD card slot in my 10v also, to my delight, reads M2 cards!
I have a load of these lying around (I have had a lot of SE phones in the past, the M2 micro cards just accumulate...) and thought I would give it a go in the reader. It was an odd fit - felt like it wasn't supposed to go there, but what the hell - but it mounted in OSX perfectly.
Very happy! Thought I would share in case anyone else was in the same boat.