In mid April v12.0.0 software began rolling out. I was able to update a Roku Ultra(4660RW) and 2 Streaming Stick pluses(3810RW and 3810X) immediately. However one ST+(another 3810X) is yet to update from v11.5 software. Since the original software push in mid April with build 4171 and newer build, 4175, was pushed. And yet the one 3810X still is not updating to the latest v12.0.0 software.
Is there any reason the one ST+ has not been able to update to the latest software yet?
Also have 2 TCL 32S327 TVs (8116X) that are still on v11.5.0 software and not updated to v12.0.0.
Basically, you'll get it when you get it.
Roku rolls out its updates individual Roku installation by individual Roku installation, with an update schedule known only to Roku. If you have multiple Rokus, they may not become eligible for the update at the same time, even if they are the same Roku model.
I haven't been on my TVs yet today, but as of last night all of my three Roku installations were still on version 11.5.