In almost all cases, a PlayStation Plus account is needed to play online multiplayer on the PS4™.
If a PS Plus member registers a PlayStation 4 as their “primary” system, anyone who uses that system has the ability to play online multiplayer, regardless of whether or not they are PS Plus members. Additionally, as many as four players can simultaneously play online on the same console, even if they don’t subscribe to PlayStation Plus.
Click here for additional details on sharing a primary PS4. (Coming Soon)
More information on PlayStation Plus, including how to subscribe, can be found here.
Free-to-play games are exempt from this requirement and can be played online with no PS Plus subscription. Examples of games that fall into this category are: Blacklight Retribution, DC Universe Online, and War Frame.
copy/pasted 2 week old PS4 Online Multiplayer Reqs and Exceptions.
Edit: it doesn’t specify any future games, but unless they change the part that says “free to play” and add Evolve specifically, which is doubtful, it looks like a PS Plus account is required.
Edit 2: I was gonna put the link in the first edit… https://support.us.playstation.com/app/answers/detail/a_id/5060/~/ps4-online-multiplayer-requirements