I think it would be incredible leverage of a familiar framework, without the hassles of having to build it from-scratch.
There were lots of complaints about the deficiencies of the previous system. It will be especially nice if it is possible to have an auto-mod-download feature for multiplayer games i.e. If the host multiplayer game is based on one or more mods, all players which joined the game in the lobby would automagically download the mods.
At most a prompt stating the names, sizes, total size and estimated time for download would be shown up to the player, and if the player declines he goes out back to the lobby.
*puss-on-boots-eyes* pretty please?