I have not read any ABC release that would indicate that the ABC network feeds will transition to 4:2:2. The technical bulletins and also the on-screen message on ABC feeds only reference the transition to HEVC. I believe that the poster on TVRO is referencing an earlier post on Rick's, where a member noted that the IRD recommended by ABC is capable of 4:2:2. If anyone has an ABC technical bulletin that states the transition is to HEVC / 4:2:2, please post. Otherwise, the post on an ABC transition to 4:2:2 is only gossip.
BTW... Watching 4:2:2 is either free or very cheap! Streaming 4:2:2 from the OS Mio 4K to my smart phone right now and mirror to my Sumsung 4K TV or use an Android tablet or a $50 Android Media box from Ebay or Amazon.