When I interviewed at Apple I talked about Objective-C vs Swift with multiple developers. Most seemed to indicate that due to the millions of lines of code already written in Objective-C that they, at least personally, were highly unlikely to rewrite them in Swift because it currently works and it's not worth the change over from a product standpoint. In fact a couple of time seemed hesitant that Swift was the future when I talked to them about it.

I understand not wanting to rewrite millions of lines of code but I feel like they should at least want to make a slow transition of at least many of their apps to Swift (since it can bind with Objective-C it's not like it has to be done all at once; it could be something where they spend a small percentage of time doing off and on). After my interview though I got the impression, at least from the developers I talked to, that they will probably never use Swift unless they have to.

Edit: I would like to point out, in case it's not obvious, that my case is purely anecdotal. Reading responses here and searching around Google is seems many inside Apple are excited about it which could very well be more than the people not excited about it. Still, I'd like to see some more platform support as it appears small at least to me looking from the outside.