BktBallRef wroteThe only "change" is that the universal signal that everyone used indicating a thrower can run the endline is now official.
It's been an official IAABO signal since 2009-10. But, like BktBallRef stated, it's been an unofficial signal, for many officials, not just for IAABO officials, for a lot longer than that. We were using it, here in my little corner of Connecticut, before there was such a thing as official IAABO signals; back when IAABO guys, and gals, were still using NFHS mechanics, and signals (without an official run the endline signal); also known as the good old days. Now we're all legitimate signalers, not NFHS bastard signalers.