As well as Plasma 5.26, there has already been an update to KDE Frameworks 5.99 this week, and KDE Gear 22.08.2 has just hit the Arch repos.
Users of other DEs need not fear that they are missing out on updates. Xfce 4.18 is scheduled for release by Christmas, and Gnome 43 may even hit the Arch repos by then 