I'm going to put my wish in terms of having variety of tournaments, which, as has been pointed out by many here,
as one of the key points not only to attract new fans, but also for the longevity of a game.
IMO, one of the most important features in EA-series Cricket games has been the variety it provided in terms of tournaments.
There is World cup, Knock-out cup, foreign tours of various countries alongside England & Australia domestic tourneys.
That's quite a healthy variety to have. EA 2002 used to unlock Sharjah cup after winning World cup in normal or hard..that was a seriously cool feature.
I'd like to have customizable tournaments in AC13 as I've always liked to play multi-nation limited-overs tournaments.
I always used to play these kind of tournaments in EA 2002, 2004, 2005, 2007. Also BLIC 2005 provided option of customizable tourneys.
I'd often pick 3/4 minnows or 1/2 top teams, 2 minnows for a triangular/quadrangular series and fighting it out in that format was a lot of fun.
I'd like to have something customizable like a 4-nation Sharjah Cup among any 4 ODI playing nations,
or a domestic 20/50 over league among say 8 teams of any test-playing country.
For multi-nation limited-overs international tournaments apart from ICC CWC, let's keep the limit to 4 nations.
For multi-team domestic/club-level limited-overs tournaments, let's keep a min of 3/4 and max of 8 teams.
user can choose all teams from same country or from different countries as per his wish in case of domestic/club-level tourney.
League-phase can be round-robin among all the teams in 4-team tourney or among 2 groups, equally divided in case of 8-team tourney.
Winner can be decided in best-of-three finals.
For this we would need domestic teams and domestic rosters alongwith international ones (something which EA 2004 managed quite well)
If licensing is a problem, then allow creation of new customized teams and huge number of new players to be used in rosters, along with face-pack, accessory, kits and jerseys.
I'm not quite sure what is the limit on creation of new players in EAC07, but I still play EAC04 (the gameplay is unmatched, IMO) and absolutely hate it when the limit is set to 60 players for one user profile.