This has nothing to do with Tegra, as Tegra will remain reserved for the mobile market and Nvidia's Denver processors will go after PCs, servers and supercomputers.
It uses same compilers, same tools for ARM. So now, with the likes of Apple, Google and Microsoft supporting ARM, the industry we know it might change and move to more ARM and less x86. Of course, this transition will be anything but fast and x86 is here to stay, but new ARM processors could easily gain a foothold in certain niche markets.
So, officially there won't be an x86 part from Nvidia, at least not now.