When will we see some Android "M" ROMs?

[elysm1]

I know it's early and it won't likely be soon, but how long has it taken in the past to see custom roms for a big update like this?

 

[bigbluebanana]

The LG G3 ROMs popped up quite fast. I believe that there was a vid of the G2 running Cyanogen within weeks.