For me all patches that have been working on 2.1.1.11 and 2.1.1.26 are still working on 2.1.2.3 - that includes Old button styles, Launcher combined, maze lock, enhanced power menu, voicecall combined, conversation background and more ...

Only thing that doesn’t work for me is meecast event view (as they changed the native event view) but that’s not a patch though
Edit: uninstalling the native weather app and restarting homescreen brings back the meecast eventsview - so for now it’s not possible to have them both intalled ....

Everything else seems smooth so far (but I haven’t had any problems with the 2.1.1.26 either)