I don't understand the panic.
R* is one of the biggest companies, which aren't under influence of anyone (Valve-like), so they can do things in whatever way they want. They did this since GTA3, as far as i can remember (including the silence about GTA3 port), and apart from GTA4 GfWL problems and some RAGE engine optimalisation shenanigans, there was no problem whatsoever, they always did playable and good ports. Not releasing it on PC would be epic fail and i think they know it.
Considering that they know their way with RAGE engine by now, they will only take their time to fine tune everything, so we don't get another Dark Souls-like port.