The GOG release of DD already had support for higher resolutions, but was replaced with the Steam / anthology version (which is pretty much the same, except for multi-language support and a slightly better configuration program). BD got higher resolution and widescreen aspect ratio support, as well as some Vista/7 compatibility fixes and performance improvements.
BD's publisher, Focus, handled all the original download version releases, so I'm not sure if they would need to be involved in getting any digital distributors to update to the anthology version.