Soccer United Marketing, the financial and marketing arm of MLS' board of directors [aka the Owners], has applied for the .soccer domain name. So instead of .com being the norm each team in the league could end with ".soccer". It could no longer be MajorLeagueSoccerSoccer.com, but MajorLeagueSoccerSoccer.Soccer in the future.
For some details on the domain name application, here is a good article from WashPo.
Credit: Evangel at BigSoccer.com.