I'd hope so, since they're tauting it as something groundbreaking.
I'm salivating at what they could do with it.
I mean they seem like the only dev who makes open world crime games that bother with MP and thus give their games very long legs. SR only has co-op. Volition basically threw in the towel for MP in SR2. SD is lucky it even came out so a lack of MP is expected still disappointing though as once you've played through there is nothing to really do.
For GTA:V I'm expecting an expanded freeroam. We know gangs are coming and will carry over from Max Payne 3.
RDR and MP3 lets me know they learned from the appalling frontend of GTA:IV MP which was pretty shitty and took ages to get into a game and made sure certain modes died a death after a while.