Caveat: no, there haven’t been any leaks about this from Warhorse.
But should the pre-hussite wars story telling take us to Prague in Act III, that would be quite fab. Creating that city in digital might be a huge challenge for Warhorse, though, especially with the Neustadt being built since 1360ties, making Prague the third largest city in the Roman empire (if not Europe), with about 70.000 full citizens.
The famous Langweil’s paper model of Prague, digitalised in 2009, might be a good starting point, if Warhorse could revert what was transformed during baroque times. http://www.langweil.cz/project.php
What other Czech location would you like to see as the game progresses? At least some larger royal city, Domažlice perhaps? Or even Tábor?