Recently Zuckerberg tweeted that v31 may include an experimental version of the Augmented Reality API. Since there haven't been updates to CHM recently, I was wondering if it will be updated to use this new API?

You bet! I've been waiting for this for a long time. There was a few months where the AR hack was working and did a lot of the basic implementing. Once I figure out how to actually use this function, I will update. Expect something within a few weeks.