Also what happened to the statement from blizzard that mods will be made possible and are wanted?
Mods are possible and there's already nearly 100 published you can find with a simple google search (more that you can find if you look harder, KR websites, things like that). There's no support for online modding, however the things you can do with the tools that blizzard has provided with D2R are fairly extensive. BrotherLaz of the popular D2 legacy mod (which shall not be named due to rules) has released multiple news updates of a quite extensive mod he's currently working on. Additionally, most of the changes of another (more recent, maybe more recently popular) mod which tried to stay closer to blizz's vision for the game with some updates, all of the changes in that mod are possible in D2R - again minus the online portion of it. But
@art_vandelay is right, it's limited in some ways. There are cool things you can do though that you weren't able to easily do with the original game (and not set aside and made easy by blizzard), such as [
big list I edited out, but it's lots of cool stuff trust me] That's all on top of the types of things that could be changed in the original D2L text files, and interestingly blizzard has set all this aside for us to goof with. It's actually insane how much people have already figured out how to do with the tools given considering the short time span.
Please feel free to remove post if against rules.
Edit as I think of more: Interestingly, in the files that blizzard specifically set aside for modding, there are moddable UI panels, .dc6 files, and .sprite files all set aside for a TCP/IP user interface and clearly labeled as such, with areas to enter IP addresses and everything. It's most likely that they had these ui panels set up initially and then removed them from the final version of the game when it was stated that it would be a security vulnerability - and then the ui framework in the files was never removed. I can still hold out hope though that they left these in with the idea that it'd be a possibility in the future and they didn't want to scrap all that work just in case.