If anything the cities will be added to the team names. Ageo did that last year. Technically Ageo is a city as well, but the company uses it as the company name already.
So nothing happened after Ageo Medics changed name into Saitama Ageo Medics. I wonder how Hisamitsu Springs, NEC Red Rockets and so on will be called next season, but nothing happened. I thought the changes were done by now...