I think Germany is in few month over-served. We have now 4U, HLX, FR
. Both germanwings and HLX have problems to fill their planes on the most routes like Paris, London and Berlin.
The Czech republic or Poland have no LCC and together with the announcement from germanwings that they will open a 2nd hub in eastern-Europe
(or in Germany) its more than secure that the 2nd. Hub will be an airport in eastern-Europe.
And now a small info to your Berlin-question.
A few weeks ago Berlin had a LCC called Berlinjet. But Berlinjet had many many problems and now Berlinjet has drooped operation with their MD8.. The MD8.. was the sole plane in Berlinjet's fleet. But the management says that Berlinjet will come back.