2022 for retrofit of their older displays and 2024 for anything else like a Cessna 182, which will really be 2028 after Garmin has had two more product cycles.
More competition for large GA EFIS would be a big win for everyone. Honeywell/King’s announcement ~3 years ago had promise but just did not materialize, and likely the case here as well.
Avidyne’s DFC90 autopilot has great promise too and it never moved beyond the narrow slide-in retrofit either.
No one more than me would love to yell “Go Team” I’m buying one, but Garmin is the only reliable supplier for most and Dynon for a few.
Maybe someday we will get a breakthrough option for our legacy aircraft other than Garmin.