No, Michael will not give 50 Concerts in those Cities.
In an interview with German Magazine "Bunte" Randy Phillips said the following:
Question: Do you plan a Worldtour after the concerts in London?
Randy Phillips: We do not want Michael to be under much pressure. That is why we have a four-year plan, divided the world into four zones each. London is the first step, because Michael was always very popular there. Then it goes with Europe. We are thinking about coming events in Germany - we are indeed the O2 World in Berlin and the Color Line Arena in Hamburg. Then came Asia, North America at the end. But it all depends on how it runs in London. Contractually identified is still nothing.
He also talks about Concerts in Paris in a france Magazine:
Are you thinking about concerts in Paris?
Randy Phillips: A world tour is still valid. Michael loves France and the French. If he is OK to give more concerts in the world, Paris is number one on our list.