I wouldn't mind joining/setting up a Squad myself, we'll have custom made posters and everything!
I hope in the future we can have some kind of ladder or on site class ranking system (since I assume by the time things really get going, we'll have a lot of people in the ingame A+/- range) and have matches that can take place at any time.
Along with squads and squad rankings, I'd love for there to be solo rankings which would reflect an indiviual player's skills and how they work as a one squid army with their own Win/Lose rate and then set people with similar rankings up in matches. This way, one can be an active participant with a respectable rank without needing to be in a squad.
Also Squads is miles better than clans, Splatoon is something totally new, why follow old shooter tradtions now of all times?