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 @ 4.4 GHz | 16 GBs 2400 MHz DDR4 | Dual MSI GTX 970s | Dual 128 GB SSDs