The general idea of this is to be newbie friendly and easy to learn (being able to choose layouts quickly).
Check it:
http://imgur.com/a/pqYQA/all
By grouping the weapons together, it's pretty newbie friendly because I imagine a new player would be easily overwhelmed by having to choose between 14 different possible primary weapons. It's way easier to decide between e.g. just 4 automatic weapons or 3 sniper rifles.
It's designed with a cursor (and possibly numbers keys) in mind and I tried to keep mouse movement minimal.
For example if you want to select a primary, you most likely want the LR300 and for that you only have to click 3 times in roughly the same spot ("Primary", "Autos" and "LR300" wedges all roughly overlap each other).
Or selecting a sniper rifle you probably want the sr8, so "Snipers" and "Sr8" wedge overlap each other.
Generally more desirable (more used) options are closest to the previously selected option.
The reason why it's circular and not a list or grid is because humans have a much easier time remembering spatial positions than a position in a list and "directions" in a circular selection screen are easier to remember yet (also circles are sexier).
Obviously you would display pictures of your current layout on the "(0)" screen and grey out unavailable item (grenade) slots or unavailable (already selected) items within the item selection.
PS: I hope there will be flash nades in HD
PPS: WTF is "fs79"???
inb4 cs:go ripoff
This post has been edited by Lochverstaerker: 04 February 2016 - 08:44 PM