I'll conceed he did say it I missed the Morrowind comment...................he did however say 'IF YOU HAVE A DEV KIT........'
As has already been pointed out to you
As stated before, the Dev Kit version of the 360 (which is really a PC that runs/looks like a 360) is the only way to bring a mod into the game on that platform. Since that is not available to the public, we can not run mods on the 360 for this or any other game from Bethesda.
It has already been stated, by Todd, that we will not have community mods ported to the console. While it is technically possible to add mods to the game, there are too many issues to make this happen at this time. Most of those issues have to do with legal, licensing and compatibility issues. As it stands right now, without a full fledged PC to manage, edit, and recompile mods (including merged mods, mod lists, mod loading order to name a few) there is no way I would put a mod on the game on a console. I can't tell you how many mods I have tried that seem good but either just do not work, or break other mods, or the mods get broken by patches that come out later.
As I understand it,
technically there is no issue. DLC, after all, can be distributed to console can't it? And what is different between DLC and mods? Basically, the DLC has its art assets packaged into a BSA file, and uses an ESM file instead of an ESP file. There are third party tools to pack art assets into BSA files and to convert ESP files into ESM files.
However, I agree that this isn't happening for all the non-technical reasons (quality, reliability, compatibility and resource hogging issues) that other posters have mentioned. Even if no art assets could be distributed (thus removing issues of nudity or inappropriate animations - while greatly limiting what mods could do), mods would still have to be screened for language (racist, sixist or religious hatred, extreme profanity etc.) Also, voice acting would almost certainly have to be re-done: or done in the first place.
In fact the only way this could possibly happen, realistically, is if Bethesda somehow got Microsoft and Sony to agree to unmonitored mods, on a 'downloader beware' basis - and I really don't see that happening.