Lepton appears to be the new official name for Valve’s version of Waydroid (Android in a Linux container).
We still don’t have a whole lot of details about how this is all going to work, outside of Lepton enabling Android APKs for developers on the upcoming Steam Frame VR kit, but it’s now that little bit more official with a proper name and even a logo.
This is more for their VR headset that’s coming out. It will be running ARM, so no concerns there. It will allow devs to port their existing Meta Quest games (which are Android APKs) very easily.
In reality meta quest games use their Platform SDK (for things like user entitlement check, match making, leaderboards, DLC) I’m not sure it’ll be an easy port for Quest games because you’ll be missing Meta’s services that run on the quest itself.
It wouldn’t be a completely effortless port but that stuff is pretty minor especially for single player games.