Luxray is my number one favorite pokemon, and I really like this. ^^ I have noticed that many people that want or think Luxray gets a mega, it will gain a Dark typing (if it gets an additional type). I really hope Luxray gets a mega evolution.
I've looked at that one before and am not that big a fan of it. Don't get me wrong, it does look cool. But it does not seem suitable as a mega for luxray, IMO. Reason being that I have noticed that all the mega evolutions maintain an appearance that makes them recognizable to their previous stage; they do look different but still look similar. The one you linked me to, to me, goes way out there, mostly due to loosing most of the blue areas. If I didn't already know it is a mega luxray I would not have guessed it was a luxray. That's why I like the one above. It's still recognizable as a luxray, but I'm not sure about its ears, lol.
But if you still like this one better that's fine. I just want to express my opinion.
I really hope Pokemon makes a mega luxray, and they better make it look awesome.