Porkjet

PBR is delayed to a later update. It's gonna use Unity5 metalness workflow and texture packing will be slightly different than default, but otherwise it's pretty much identical in looks to the standard shader. As for the assets, at first shaders will be switched to a kind of 'semi-PBR' that reuses the existing texture inputs as good as possible (works really well, and basically this will also auto-update modded parts, you might only wanna fine tune specular maps a bit, they'll have a much more apparent effect in the PBR lighting model), then rocketry and spaceplane parts are beeing updated to fully fledged PBR, requiring new occlusion and metallic maps which are luckily easy to derive from the existing layered source files. Other parts will later follow as necessary.