The MLC model in the videos below appears to be the MLC63 AMG based on the bodywork and wheels compared to the previous set of spyphotos. The sound of the exhaust also points to an M157 5.5 liter V8 under the hood. The only wildcard is the rear diffuser which does not appear to have the trademark quad tips as shown in the previous set of spyphotos.
It is not uncommon for manufacturers to try to remove elements that tell too much about the model testing. Regardless, the MLC and MLC63 AMG are shaping up well and the design proportions seem to work. The official unveiling is not far off.