DX12 will hopefully be pretty good but will take a good 2 years before the pickup rate and gains from it are decent. From my basic knowledge it seems like DX12 is a lot different to code for so you either port your DX11 code over to DX12 making the minor optimisations here and there or you rewrite for 12 in a totally new mindset of what the driver is capable of.That would mean doubling the work load from the graphic developers as they would have to write for DX11 and 12 also the coders themselves would have to think out of the box on how their game can get the best performance with the new driver which would probably mean even more development time just for concepting etc.Hopefully with just the DX11 ports games will gain a bonus 10-20% performance increase in certain areasEspecially with massive textures and shaders can be used hopefully some nice optimisation can be made to boost them.