The post refers to Twitter MySQL 5.5. I would be interested to know what Percona, a more mature fork, is doing with respect to these recent patches from Twitter.
As far as I know, neither Percona nor any of the others have picked up our changes or anything like them. However we'll be working with them to get something that makes sense in a generally available release.
Thanks for the update. It's great to hear that there may be some work done to make these improvements part of Percona or others.