In reply to Boone B. Gorges.

Boone - I agree that it's definitely more for developers. But then I think about some users who have a bunch of commercial plugins installed where the plugin author isn't very tuned in to keeping up with WP core development and who may not be updating with taxonomy term splitting in mind. I thought maybe regular users might help raise awareness with plugin devs who are tuned out. Even if it's simply by bugging them to say, "Hey is this going to be compatible with 4.2 taxonomy changes?" :)