Gearbox and 2K Games are putting out a packaged bundle for Borderlands 2 downloadable content on February 26, 2013 for PlayStation 3 and Xbox 360. Priced at $29.99, the Borderlands 2: Add-On Content Pack includes some but not all of the post-release DLC for the game:
Since this misses out on the newer add-ons for Borderlands 2, there will presumably be another one of these bundles at some later date. And, eventually, a Game of the Year edition seems probable. At this point, I think I'll continue to wait and see what else is in the pipeline before getting any of the DLC; the core game kept me plenty busy as is.