Just last week Rockstar said "No, of course the PC version of Grand Theft Auto V isn't delayed." (I'd show you the proof, but of course "The page you were looking for doesn't exist.") Something pretty damned catastrophic must have happened over the past seven days. Friday, Rockstar officially confirmed that the PC version of GTA V is delayed until January 27, 2015.
But hey! They announced the news alongside a fancy new trailer for a game that's a year old, so I guess it's okay!
The PC version will of course have some new features, provided it ever comes out and we don't reach January 27 only to hear, "Surprise! The release date got pushed back to the heat-death of the universe." Those features include denser traffic, a higher GTA Online capacity (thirty players), prettier foliage, longer draw distances, expanded soundtrack, and (probably) mod support.
It also sounds like you'll be able to transfer your save data over from the last-gen console versions of GTA V to the PC so you (for the love of all that is holy) won't have to play through the middling, overlong campaign again in order to run around terrorizing Los Altos as the Teletubbies.