I bought an XBox One instead of a PS4 (personal preference) thinking that RoS would be a sure-thing, and boy was I wrong. Who really knows what's going to happen with consoles. I loved the hell out of D3 on the XBox 360, so I thought I was making a safe bet with the next gen consoles.
I played RoS on the Ps4 at blizzcon, and it was frikkin gorgeous, and actually one of the biggest reasons I bought a ps4, even though PC will always be my main
I have a PS4 and I'm planning on buying Reaper of Souls for it.... But I finally broke down and bought the ps3 version (I got it for $15) because I don't think we'll see the ps4 version until May - September.