There is only 4 (or 2, if don't count Gr.3 and Gr.4 versions) Ferrari, one Lambo and 2 (or 1 because of Gr.3) McLaren so far, for example. Why game should have more Porsches? 911 GT3 Gr.N, Gr.3 and Gr.4 is quite enough relative to other cars. Maybe we will see 918 Gr.N and less likely 718 Cayman Gr.N and Gr.4. But I highly doubt there will be more.