According to Odaily and Bitcoin.com News, Zcash developers have proposed reducing the target block interval from 25 seconds to 20 seconds in Network Upgrade 7.1 to lower transaction confirmation delays. The adjustment will not change daily emission or the 21 million ZEC supply cap.
The draft also proposes reducing shielded transaction action limits per block from 330 to 264 items, while maintaining the 2 MB block size limit. The proposal is open for community discussion, with implementation pending governance voting.