The Max Payne 1+2 remake is being handled by Remedy, the original creators of the franchise. R* is just funding it with their approval since
they own the IP. I expect it'll be in line with their recent titles like Control, Alan Wake 2 and Quantum Break.
If I may guess, RDR1 was not "remade," but "remastered" with recent consoles (and NOW PC) to capitalize on RDR2 and GTA+. GTA IV, while beloved at the time, was not TOO popular compared to the 3D era because it deviated itself from the arcady spin and scope that San Andreas provided.