It'll be interesting to see how the pricing structure works. If the fare is going to be EUR88 whenever you book, why book early? It seems to be the same policy that Now Airlines are planning which may (or may not) cause cash-flow problems.
Down here at Stansted we have both Ryanair and Air Berlin flying to Berlin (AB into TXL). AB's loads seem to be fine but not too sure what FR's are like.