I've seen similar ads in other apps/ web pages of late. Had 3 on my laptop the other night, and I've seen more in the last monthe than the last 2 years, or something to that effect.
Love the idea of the battery swaps, this is at least the 5th mention of BlackBerry at the Knicks game this month on these forums, looks like they're getting some good exposure.
But yeah, I've been seeing a lot of BB advertising when it comes to the Knicks. Not so much commericals, but tweets, emails, and on TV during the game.