Regular rate reduced from 19% to 16%
Reduced rate reduced from 7% to 5%

This decision has to be put in writing and agreed upon by the German parliament (which is why there are no official publications by the German tax authorities available yet). It is safe to assume that this change will come into force 01 July 2020 considering the frequency of law changes in the wake of COVID-19 and that the governing coalition is in agreement on this topic.

See link to newsflash of the German tax authorities below (in German only):

https://www.bundesfinanzministerium.de/Content/DE/Standardartikel/Themen/Schlaglichter/Konjunkturpaket/2020-06-03-konjunkturpaket-beschlossen.html