As trailers, PSA’s or featurettes come close to airing, they need to be classified equal or less than the film or item they precede. The Alberta Film Ratings site is notorious for posting these classifications publicly, which can provide some insight into when to expect some of these items to hit the air.
One of the latest items to be classified, is entitled G.I. Joe: Retaliation Featurette, and it appears on the site with a PG rating and clocking in at just under four minutes. The content of the featurette itself is unknown, but this site has pretty close to 100% reliability when it comes to predicting these things.