XDA developers had just launched the Liquid Smooth ROM and it is designed specifically for the HTC One M7. The custom ROM contains the Android 5.0 Lollipop and it allows One M7 users to skip the wait and apply the OS update straightaway.
Of course, the LS ROM is still in its early build and there are some issues with it. Regardless, XDA has already promised to update the LS ROM accordingly and free it of every issue.
So if you are a One M7 user and can’t wait to get a feel of the Lollipop, then you are highly encourage to head down to XDA’s website and claim the ROM together with the installation instructions.
However, you must note that proceeding with the process will void your One M7’s warranty and it also carries a risk of bricking your smartphone. If you are not willing, then you should just wait until HTC launches the official update for you.