I'm an Insider currently on Windows 10 Pro v1803 build 17133.1 and the Store still only shows four tabs: Home, Apps, Games and Film & TV despite being the latest version 11803.1001.6.0. I am in the UK so perhaps the new tabs are only switched on for certain territories? I can understand why the Devices tab might not be there for everyone but not, for example, the Edge Extensions one.