Vince Zampella, from Respawn Entertainment explains:
There are things we want in the game that we didn’t get to ship in the final game. We’ll add private matches and things like that for free.
Zampella explains that – as is typically the case – if you pick up the Season Pass, you’ll save money.
An even nicer bargain is available if you’re looking to grab Titanfall on PC. Pick up the Digital Deluxe edition, which includes the base game and season pass for one low price (AU$99.99 in Australia, check with your local retailers). There’s no word as yet on whether consoles will get a similar bundle – and even less on what the Season Pass will include or when they’ll be released.