Actually the Schengen pier “C” is undergoing reconfiguration and will (partly already does) only include C-class stands. If I recall correctly, in the end it should have 4 C stands at either side.
Terminal 2 is going to be expanded in its southern part in the near future, adding (many) more wide-body stands, and the primary use of terminals (Schengen x non-Schengen) will be switched:
The articles are in Czech, but they include schematics of the plans