Also, new Turris OS 4 will be released for Turris Omnia, too:
Even if Turris Team would stop supporting Turris Omnia its basic functionality is covered by upstream OpenWRT (Currently there is no LED and SFP support upstream but at least SFP-support is going to be pushed upstream, see link above for details) (search forum here and OpenWRT Docs).
Upstream OpenWRT doesn’t include foris, updater, btrfs (schnapps) and everything else turris-specific of course…