It's being demoed on PS3, which seems to indicate that the PS3 is the lead platform. Sony also announced a partnership with R* that will likely lead to more than just the headphone bundle.
Also I'm not going to renew my Live subscription. F that.
Core i7 5820K hexa-core CPU || 8 GBs 2400 MHz DDR4 || Nvidia GeForce GTX 970 || Dual 128 GB SSDs