Considering how much Bethesda has shown they care for the PC (we need to look no farther than the horrible UI.), I think it's a safe bet that they have never had the intention of ever providing additional hires textures for the game, for PC.
"IGN: Will the PC version support DirectX 11?
Todd Howard: Yes, but I guess the real question here is do we take advantage of DX11's big new features and the answer is 'not specifically'. Our graphics work centers around doing things that will look the same regardless of platform, and sometimes that implementation will be different on the 360, PS3, and PC. "
http://pc.ign.com/articles/115/1158651p2.html
"Basically, it's mostly a DX9 game in terms of [how the] shaders work," Todd told AusGamers. "When it comes to DX11 there are things they give us for free in terms of performance gains, and that's really what I meant." http://www.ausgamers.com/news/read/3049109
I wouldnt hold my breath. Didn't they also boost quite a bit about their dynamic snow, with snow that attach to the textures and can melt etc. Maybe in a patch if we're lucky, because it does seem to be implemented (the snow is an alpha layer on top of the rocks etc, i dont understand why they would make it like that otherwise).. Hi-res textures from Bethesda i find highly unlikely..