Oh, open source files. You might not know it, but it's awfully hard to write words about kernel source going live on Samsung's website, something we do quite often here at Android Police. But, if you're into this sort of thing, you're probably not too concerned with what I'm saying, so much as the links to those files, which I have. And I'm going to make you scroll to get them!
Samsung has officially released kernel source for the Cricket version of the Galaxy S III, Verizon's Galaxy Tab 2 10.1 with LTE, and the MetroPCS Admire 4G - which is an as-yet unannounced phone, and probably the sequel to the original Metro Admire.
Interestingly, none of these devices are actually available yet, so I guess Samsung's pretty on-it with this stuff. Or they're just bored on Thanksgiving. Here are the respective links: