I’ve finished implementing 50 of the new abilities so far. 
Considering I’m working these days and it isn’t even the weekend yet, this is pretty good progress. 
Speaking of abilities… here’s the icons for every ability that will be in the game as of the next build. Crazy
Why is it shaped like an L?
Just how the texture atlaser chooses to pack them: this is actually a screenshot of the texture atlas ability icons use. (Not sure how far your coding knowledge goes, but in brief, texture atlases are used to reduce the number of total textures that have to be accessed to draw the scene, so rather than 1 texture per 1 ability, you make a giant texture with all the abilities. Fewer textures, even if they’re bigger, leads to better performance.)