So Mobile World Congress is here, and Barcelona will be full once again with up to 100,000 people from the mobile and wireless industry worldwide. Many of the familiar MWC players will make their usual splash – recent issues of Wireless Watch have looked at what Nokia, Ericsson and Huawei will be demonstrating and discussing. But each year there is a shift in the landscape, which draws some new high profile companies into the Barcelona sunlight. Virtualization, distributed cloud, fog computing, vertical market networks, the Industrial Internet of Things and flexible spectrum will be among the key themes of the show, and while these offer ways for mobile operators to diversify their revenues and transform their cost bases, they are…