darth pravus :
It almost certainly will but it might not be a good port and will be several months after general release.
Why will it not be a good port? How can you tell it from now?
PC version will most certainly come, but it will come by the end of the year. That's going by the time R* takes to port games to PC, adding those exclusive to Windows features into the game. Also, looking by the current leaks and scope of the game, the game might be as big as 40 GB (?)
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If this game doesn't come for the PC, then, it will be real sad.