Wimdu are going to court in June. October has been mentioned as a potential date for AirBnB elsewhere. Seems odd - I would have thought they may have partaken in a joint action.
http://www.cnet.com/uk/news/berlin-law-hobbles-airbnb-rental-business/
The new law (which I fully agree with) applies to whole apartments in residential buildings. There are grey area's with the new law of course. Holiday lets in 'commercial properties' are exempt. Where the owner/leasee is in residence and the renter is in a "Wohngemeinschaft" (renting a room)...