If you were wondering why so many MMOs are making the jump to PlayStation 4, wonder no more. Before it seemed like it was primarily games that had a high number of users, but now it seems like it'd just be really, really easy to do.
In an interview today, Steve Sinclair said that it took just three months to port Warframe to PlayStation 4. For the sake of three months work, you get access to a whole new userbase, at the beginning of a console's life cycle, when users are hungry for new experiences.
Sounds like a fair deal to me.