Yesterday's episode played host to this new guy up above, who outside of using a steampunky style wheelchair actually has a pretty interesting back story. He was added as part of a Make a Wish Foundation pledge. For those that don't know what that is, it's basically an organization that grants a wish for a child diagnosed with a life-threatening illness. A few people pointed out that unlike most of the incidental ponies, Stellar Eclipse actually popped up in the credits.
Unfortunately, the poor kid has Spinal Muscular Atrophy type III (more information on that over here). It looks like Make a Wish collaborated with the guys over at DHX and added his character, voiced by him, to the show.
Outside of that, we can't elaborate too much further for the sake of not bombarding him with the brony armada (by request). I'd say this is a pretty awesome occurrence though. DHX and Make a Wish rock!
Thanks to everyone that sent in bits and pieces about it!
Note: It was pointed by them, that the name was actually misspelled in the credits. Levasseuer not Lavasseuer