Bethesda never announced a DLC a month after release. They've signed an exclusivity agreement with Microsoft so that all thepaid DLC will be released a month before every other platform. That's it. Nothing about when the DLCs will be released. Plus it's been confirmed that these DLC will be bigger Fallout 3 style addons, not the 10 minute Oblivion DLC job.
The Xbox and PS3 are seriously underpowered in the RAM and VRAM departments. The high resolution texture pack makes my high end GPU push 1GB of VRAM. The Xbox has 256MB of VRAM. If you try using the high resolution DLC on the Xbox or PS3 you'll literally be reduced to a slideshow. It's not a case of them preferring the PC, it's a case of the PC having the possibility of having much, much better specs than an average computer/console, so they've released a pack to accommodate that. Nothing wrong with that.
Also, the next generation of consoles won't be out this year. It'll be a long time yet.



Let them take time.