Three patches back, Riot reorganized the folders and locations of files for the client to use. When they did this, they created many new empty folders that suggest many things, especially of menus or player communities.
Background about Data Mining
I commonly would mine through the client of League of Legends in order to get an idea of how it works and replace skins or pictures in the game. For example, a month back I replaced the random "?" box that league of legends uses with the ? box from Mario. I've also been able to preview skins not yet released (Ex; Battle Bunny Riven).
Why we noticed
It's most obvious to players interested in changing things such as skins, for we used to tell each other to...
Go to C:\Riot Games\League of Legends\RADS\projects\lol_air_client\releases\0.0.0.XX\deploy\
o 0.0.0.XX is a placeholder. The XX will be a number that stands for which version the client is now at.
This would bring us to an area with a folder named characters and assets... but now it has only Assets. Everything seemed to have been moved into there.
Within Assets we see;
That's the first big change... Go into data and we find;
...but then, to my surprise, that champions folder doesn't hold the files to edit our skins icons or the skins... just other information I hadn't seen before. @_@
Inside images we find, well, A BUT LOAD of stuff... Here's a picture.
...Most of them are empty...I had the thought that they may be used while League is running, but I'm running league- and nothing is there. :S Inside talents is backgrounds, and other folders have more folders like that, but these sub-folders have nothing in them either :O!
~ ~ ~ BUT WHATS YOUR POINT? ~ ~ ~
I believe that this new format is for the upcoming replay mode that Riot has confirmed. I expect the menus to be changed up, especially when supremacy is released.
TLDR: Three patches ago, Riot reorganized the files in the game's folders, creating many empty folders that suggest upcoming menu changes or player community pages.