The giveaway here is the "Electric" sticker on the windshield, warning potential first responders of a high-voltage risk. Our spy shooter cites info from "factory insiders" giving the EQB a driving range of up to 310 miles on a single charge, though European range testing, even on the new WLTP cycle, is fairly generous compared to how the EPA rates range here in the U.S. Still, this should have a useable range that rivals pretty much anything on the road today.
When it comes to nomenclature, this would likely end up being called the EQB, to follow the EQC in Mercedes-Benz's new all-electric lineup. The eventual look of the EQB could get more of its own styling to distinguish it from the internal-combustion versions of the GLB. Those aforementioned factory insiders say it'll be more aerodynamic than the GLB it's based on. We wouldn't be surprised if that meant smoothing out the sheet metal hidden under this camouflage, but we hope it still keeps a fair share of its boxy cuteness.