No joke after some of the things R* have added to GTAO I wouldn't be surprised if they added some Cowboys vs Aliens type sh*t for RDO or whatever it's going to be called.
Online (multiplayer) isn't an issue. See how well it was done in GTA IV, RDR and MP3. It's R*'s greedy nature that is.
I read about MP3's MP being terrible and horribly unbalanced.
Online is good as long as long as it's designed right. GTA IV Multiplayer was great, dunno about RDR as I've never played it, same for MP3 but read bad things about it, and GTA V Online was an absolute disaster.