Just to clarify, yes, you will get MGO with MGSV.
Konami has confirmed that the anticipated return of Metal Gear Online will come packaged with the upcoming Metal Gear Solid V: The Phantom Pain .
Multiplayer footage of MGO debuted at The Game Awards over the weekend; if you missed it, you should definitely check it out . And it's great that MGO won't cost you anything extra; this means that when you're done with what should be an epic MGSV campaign, you can dive into the multiplayer fun. Expect a diverse, rewarding gameplay system that will encourage you to flex your tactical muscle.
MGSV is due out some time next year for the PlayStation 4 and Xbox One. A PC version is coming as well but Konami hasn't issued a release window for that one yet.
Related Game(s): Metal Gear Solid V: The Phantom Pain , Metal Gear Online