I posted this in another comment thread, but I noticed it's not on the front page, so some people may miss it,

http://penny-arcade.com/report/editorial-article/destiny-bungie-and-the-pc-why-the-ambitious-game-is-likely-coming-to...

“The interesting part is we, from the ground up, from the very beginning, we have made sure that [Destiny] can be on multiple platforms,” Parsons assured me. “It’s one thing to say it, it’s another to design and actually architect for it, which we’ve absolutely done. “

This is a pretty long response for something that could have been a simple “no comment,” but Parsons talked about the difficulties in technology Bungie was facing in order to get all the systems of Destiny up and running, and the challenge of making a game of this magnitude that was also a smooth experience for players. With the size of the investment being made by both Bungie and Activision, it makes sense to keep an eye on current and future platforms.