Just a brief working note on my current understanding of Eurasian Y-DNA diffusion and diversification patterns after the out of Africa migration.
I am assuming here that the newly proposed Y-DNA macro-haplogroup MNOPS (downstream of K) is for real and that it includes (for parsimony reasons) haplogroups K2, K3, K4, M, NO, P and S. This is not sure at all but is a quite reasonable possibility.
I used color codes for the main lineages (blue for DE, orange for C and red for F). The pink line represents the main route of the Eurasian migration, the red arrows represent the main flows of F and K derived lineages, which are the most complex ones. The light red dotted ellipse represents the most likely urheimat of F, IJK and K, as well as other derived lineages such as H and P. For simplicity reasons I have not depicted the expansions of C and D, nor of P and NO.
In order to infer the possible homelands of each of the lineages I used common sense, of course, but specially I used the following method: halfway point between the centroid of the lineage and the estimated homeland of upstream clades, when no centroid was available, midpoints between downstream centroids were used. It's notable that Northwest South Asia seems to be the homeland of the most important Eurasian Y-DNA lineages, not just of F but of several major nodes downstream of it (H, IJK, L, K, P, R), however the MNOPS "boomerang" migration, if confirmed, also has its own significance - and not just for Eastern Asia and Oceania. I wonder if this peculiar Y-DNA flow into SE Asia and back into South Asia is related with the flows of mtDNA N and R.