One finally got its 5.1.1 (+Cyanogen
OS 12.1) update. Rolling out to 2% of users for now, but here are the manual zips if you want to flash it manually. Full ROM + incremental OTA that's half the size (from 5.0).
Mine just finished updating and booted. Yup, I'm still with OPO as my daily driver for various reasons (mostly lack of time to set up a new device, looming final release of M that would probably require a wipe on my N6 anyway, plus waiting for the new Nexuses).Update
: Also brings home button to Chrome? https://plus.google.com/+ArtemRussakovskii/posts/7DZAZ9G4xVB