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.