I agree with Katalyst with reducing the length of the league. I know for a fact I won't be here for 12 weeks due to moving out and starting university sometime in october.
Secondly I think the original post needs to be a bit clearer on when the league starts as i've heard two dates now second and ninth of september. You should probably also make an official rules list on banned powers etc (perhaps just copy and paste from Kats old league with a few adjustments) this way there will be no confusion on what is and isn't allowed, also easier to get rules during practices under way.
Another thing is rules on trading players across teams. I also disagree with the rule regarding internal ringing. All globals listed under roster should be allowed to play whenever as long as members of the team are playing the accounts, no one here is stupid enough to believe that internal account sharing isn't going to happen so just drop that rule and let first and second accounts be played at the same time.
Lastly I would deff increase the roster cap to at least 9 if not 10, in previous leagues theres been times where a 16+ roster couldn't even field 8 during match nights, just because this is a 5v5 league doesn't mean there wont be no shows at the same quantity and frequency as 8v8 leagues.