Will that change anything? If you read photovoltaik, you would think the whole thing may be thrown out. They fail to mention what Reuters explains above:
The Bundesrat... has no real power to stop or slow down the law.
Overall, Reuters has been the best source of info about this issue of all. German websites seem infested with party politics, which has made it difficult for me to know what is worth writing about and what is just wishful thinking.
So we will have to wait and see whether the Bundesrat's opposition to the 16% prooposal makes any difference at all. There is also talk of postponing the cuts (scheduled for Juli) to October 1 - but talk is cheap.