Report contains several factual errors
Once a fierce opponent of data retention
That's not true: Germany agreed with other member states on the directive that led to mass snooping (it was a pioneer of the technique back in the 1970s) only to have the law struck down as unconstitutional. Much to the disgust of the government at the time. There was no majority in the previous government for a revision and the Commission had initiated action for failing to implement the legislation until the ECJ ruled. The lack of urgency about drafting a replacement reflected current jurisprudence that the constitution trumps EU law.
There is no doubt that the current draft will be sent to the constitutional court even if the current opposition officially does not have enough votes to enforce this. It might squeak through because only metadata is being collected. There is even talk of putting the law up for automatic review given the lack of evidence that any of the mass surveillance has prevented any attacks and is very expensive.