Quote"i know that air berlin took over 3 F-100's from airberlin" - Sorry don't understand that.
There are two companies here: Germania and Germania Express
What may be of interest is that Germania is a company that owns and operates several (30+ I think) F100s, and they wet lease these to other european Operators, the three air berlin F-100s are an example. They are wet leased for capacity reasons, so yes, it is likely that they will leave when air berlin's fleet expands (with the arrival of the busses)
Germania Express, GEXX, is a LCC that operated about 15 F-100s, the set-up being that they were wet leased from Germania. It is Gexx that will be taken over by dba, so these 15 planes will now be wet-leased by dba and repainted into dba colors.
I have no information about the introduction of more F-100s, I have only heard that the operators are not happy with dispatch reliability in the winter, so I doubt it.....