I see a number of EIPS are listed as Accepted Changes, but it is not clear if all the changes are for Metropolis/Byzantium, nor if all Metropolis/Byzantium changes are there.
You can find the Meta EIP listing the changes included in the
hard fork named Metropolis/Byzantium here: https://github.com/ethereum/EIPs/pull/609
Metropolis has been split into two upgrades; Byzantium and Constantinople.
Metropolis/Byzantium is still describe in EIP 609 as above, with a nice ELI5 summary of changes from @avsa here.
Metropolis/Constantinople has almost no information I can find, except that EIP96 has been deferred until that upgrade.