Hey guys,  
 
I have done some searching around and all the explanations I find on how the ladder works seems very poor. Its either outdated, or just doesn't explain some of the most basic features. For instance, a bonus pool is a pool of points that accumulate over time and adds a bonus to your points when winning a game. Ok, but what do points do? Do points move you up in your current ladder or do they promote you to the next league? Do you need to be the top of your ladder to get promoted? 
 
I usually don't care about this stuff because I have had a 50/50 win rate in my league basically since the start and its always been fun. But lately I have been doing much better. Just today I went 10/0, and the day before 9/2. I seem to be only moving 1 position in the ladder around 3 or so wins, and currently at 17. I have even been beating players from the league above and the game states "even game".  
 
I read that you can only move up in a league during a "review", but it gives no info on when these reviews happen. Is it once a week or once a season? 
 
This is the same problem I had with WoW arena (wotlk/cata), they make the system so complicated it can take away from the competition because there is so much behind the scenes that is kept hidden.

@Truant19: Bonus pool gives you bonus points at the end of the match. If your bonus pool is really high, for example, you'll gain 25 points for a win; if it's really low - 18 (random numbers, just to generalize). Its purpose is to give the players who haven't played in a long time an edge and a chance to catch up.
 
You also don't get promoted based on your place in a league; what matters is your MMR indicator which depends on who you win and lose against. 
 
I don't know how the promotion works, but I know this: the only way to get promoted is to win games!  So don't really bother with some special times when to play or something; win a lot, you'll get promoted. That's how easy it is. Also I don't know who told you about the "review" but it sounds like complete and utter bollocks to me.  Win a lot, get better = you'll get promoted. Hope that helps.