While CyanogenMod 11 code is being pushed to the github repositories by the CyanogenMod team, developers are actively compiling CM11 ROMs for various devices. While there have been AOSP ROMs for devices like Sony Xperia Z, the HTC One has both AOSP and CM11 ROMs. Suyash Srijan has compiled an experimental version of the CyanogenMod 11 ROM for the HTC One and is actively updating it as and when code gets committed. While there are other CM 11 ROM’s too, Suyash’s ROM is the only one that has Infrared Blaster and ART (Android Runtime) fixed at the time of writing.
The ROM contains Gapps as well so you don’t need to flash an additional package to get a Google account on your device. All you need is a proper backup, preferable a nandroid backup using OBackup app. You can also backup data and APKs separately using our data backup guide. Of course you need the latest CWM recovery on your device. You can use ROM Manager to check for updates on CWM recovery.
What’s more? Download the ROM, place it in your device’s storage and flash it via CWM. This should get you CM 11 up and running on your HTC One. Make sure you restore apps using Nandroid Manager.
For issues and downloads of the ROM, head over to Suyash’s thread.