The new version is listed on the Australian Classification Board.
It seems that Pandora is about to get a facelift, as there will be a remastered version of Borderlands coming at some point in the near-ish future. The information came via the Australian Classification Board, where the game was listed.
The contents were described as modified, so this could indicate not only to better graphics, but the inclusion of DLC as well. Platforms, however, were not confirmed. It was listed as multi-platform release, but nothing concrete was offered. 2K is yet to make an official announcement.