Listed as build OPM1.180104.166, nothing besides the update to the May patch is listed in the changelog, but provided this is happening so quick, I don’t think owners are going to mind.
The update weighs in at 91.5MB.
We're rolling out a new software build that includes May security patches. Check your Essential Phone for the update. pic.twitter.com/aScFKkOD7V
— Essential (@essential) May 7, 2018