http://www.nintendolife.com/news/2015/03/guide_everything_we_know_so_far_about_nintendos_deal_with_dena_smart_device_plans_and_more

Nintendo has announced a partnership with DeNA to bring its IP to new games on smart devices, and to also deliver services across all platforms including a loyalty programme to replace Club Nintendo.

DeNA - pronounced 'DNA' - manages and provides infrastructure for mobile and online services. With its headquarters in Tokyo and over 2000 employees, it owns and manages a number of subsidiaries in the mobile space, particularly in Japan. It partnered with Disney for work on mobile games in 2012, and owns the Mobage mobile gaming service, which is particularly popular in Japan with over 30 million users.

Does this mean Pokemon is now mmorpg via WiFi?

not exactly they said they are considering all of their franchises for this, but wont be porting games directly, meaning they'll make entirely new games for mobile devices. In short, it's not impossible but it could be so many thing there's no telling