A new Canon EF-M 28mm f/3.5 IS STM macro lens for EOS-M cameras was registered in the Russian certification agency Novocert:
The official announcement will most likely be at Photokina in September.
Canon currently has four different EOS-M lenses in their lineup (five with the EF-M 18-55mm f/3.5-5.6 IS STM kit lens) and none of them is a macro:
Via Digicame-info