The Ninja Gaiden series are some of the greatest action/adventure games of all time.  The Steam platform has risen in popularity over these last couple of years, and now is a great time to have them made available on this service. 

Yaiba Ninja Gaiden Z has been released, and DW will be seen on the platform.  These occurences mark a very positive trend.  DOA 5 Last Round has also had some mention, but nothing definitive at this moment.

The fans prefer the Black(XBOX) and II(XBOX 360) versions of the first two games.  This is just info from reading various forum topics on the subject.  If we were to receive the games as a trilogy it would be up to KOEI TECMO to decide which versions will see the light of day. 

It is expected that NG4 will one day materialize, and I've pondered whether the PS4/XBOXONE will receive an HD Trilogy pack of the original 3.  If so, and that is or will be planned, then please consider them for Steam/PC as well.  Thank you Team Ninja and KOEI TECMO, and know that there are many fans and interested buyers for these great titles.