As Rome sweeps the streets clear for the Bond 24 production crew, a casting agency is assembling an acting crew for SPECTRE's shoot in Mexico later on in the year. These auditions were held in Mexico City on 5th February.
Considering the amount of publicity this casting call is receiving (fliers, T-shirts, etc) it would appear that a large group of extras is required.
With Skyfall, a massive call for extras was issued when the crew filmed in Turkey, which acted as the pre-title sequence for the film. As Mexico is expected to be the last shooting location for SPECTRE, it might be wise to assume that Mexico's scenes will take up some, if not all, of the action in this film's pre-title sequence. Only time will tell.