Well looking at the background of the two mascots, it looks like White Kyurem will be in White 2 whereas the Black Kyurem will be in Black 2. Plus the text color could indicate that as well.
But I'm hoping for this as well, to be honest. I chose Black out of the two only for Reshiram (and I couldn't go back on my decision because my brother didn't want to give up getting White! u_u) and the version exclusives were just meh. So here's to hoping White Kyurem is the mascot for White 2, so I can get that and be satisfied. ...Unless they switch version exclusives then that would just be a tease. :(