All Things Linguistic

From the official website of the Canadian Department of Justice:

The use of the singular “they” is becoming more common not only in spoken but in written English and can prove to be useful to drafters in a legislative context to eliminate gender-specific language and heavy or awkward repetition of nouns.

Consider using the third-person pronouns “they”, “their”, “them”, “themselves” or “theirs” to refer to a singular indefinite noun, to avoid the unnatural language that results from repeating the noun. 

Now if only we could get the Canadian government to approve of “yo” as a third-person pronoun… But seriously, I’m really excited to see formal official media recognizing the legitimacy of this construction that speakers of English have been using since at least Jane Austen’s day and that pedants have been disputing since much more recently.