Sony has announced they will be "aggressively" moving into the mobile gaming space, referencing popular [fad] Pokemon Go's success.
Sony has dabbled in mobile in the past with the Xperia line of phones, offering users a gateway to select Playstation branded games. The concept never really caught on, and Sony continued to develop their dedicated handhelds; most recently the Playstation Vita, which too struggled in the market.
It comes as a not-so-surprising time when Nintendo recently embraced mobile with Miitomo and partially with Pokemon Go, although Nintendo only partially owns rights to the latter.
Many gamers are quick to express concern as the mobile market has shifted to heavy microtransaction/freemium titles where the more you pay, the more you progress; leaving little room for well-designed traditional style gaming experiences. Sony has yet to announce their plans, so fans of the Playstation brand will have to wait to see how they handle it. Sony did announce back in March a new studio, ForwardWorks, to focus on smartphone games.