Metro-scale network equipment provider Strix scores with a giant NTT West contract in Japan: The NTT subsidiary will roll out 802.11j service, using the 4.9 GHz band. Strix says the deployment will ultimately pass 50m people. The deployment uses Strix's Access/One OWS and IWS (outdoor and indoor) multi-radio products that allow voice, video, and data with quality of service scheduling. Update: Strix retracted this story on a later date, stating that they weren't providing accurate numbers or numbers with permission! It's also unclear what their total involvement in whatever scale project this is turns out to be.
802.11a isn't allowed in Japan, while 4.9 GHz is used for public safety purposes in the US and military purposes in some other countries. Strix is the only mesh vendor, according to Unstrung, that's selling into the 4.9 GHz band for 802.11j support. SkyPilot and others offer 4.9 GHz public safety gear in the US.