I am aware that there have been ongoing efforts to introduce some small reforms in the mixed-member proportional (MMP) system in Germany. The main challenge is to prevent the Bundestag from expanding so much in size, since a Constitutional Court ruling mandated full compensation.
The brief background is that the system has long had the potential for adding seats to cope with “overhangs”, which happen when a party in a state wins more districts than its party-list share would entitle it to. The Court ruled that the procedure in place over many elections still left the system unacceptably disproportional. (Manuel posted a good primer on the changes back in 2013; see also a long and interesting comment thread here on F&V.)
There are proposals currently being considered in the Bundestag that would attempt to limit the expansion in the chamber’s size that the current system allows. For instance, in 2017, the size went from the basic 598 (299 nominal and initially as many list) to 709 (401 list seats!).
The article I have is from AP, and (predictably) is thin on detail. All it says in the way of substance is:
The new proposal mainly involves keeping the number of constituencies unchanged in the 2021 election but slightly reducing the number of extra seats. By the time of the 2025 election, it calls for the number of constituencies to be cut to 280. A reform commission is supposed to produce a detailed plan.
The article also notes that opposition parties “weren’t impressed.”
I hope some readers might have more detail on what is being proposed.