The Breakdown The new Mercedes GLA will offer both combustion engines and drivetrains. The fully electric GLA is going to replace the EQA. The GLA is hardly the most exciting model in Mercedes’ sprawling portfolio, but it’s one that the company’s accountants favor. Although Mercedes doesn’t say what we’re about to see next week, the GLA is likely to debut with both combustion engines and electric drivetrains. The work-in-progress crossovers also had flush door handles to help improve aerodynamics and extract a bit more range from the electric model.