Hey there,
as far as I am aware, there is only Bronze and Elite league for Go right now.
I'm not realy an expert on how Arena works in detail, but I think BGA tries to somewhat flexibly decide on which/how many different tiers of leagues there are for any given game.
So for games that have more players than us, you will see Bronze -> Silver -> Gold -> Platinum -> Elite, here it's just straight from Bronze.
For cheating, I don't. I just queued for a couple of turn-based games, so once some more have finished their current games, I am sure others will get to Elite league and very likely overtake me, unless I play more games myself.
(A bit offtopic, though, I am pretty confident in that some users here were using AI during games, though not in any of the games I have played this season, yet.)
It's usually hard to find real-time Arena games here, which is why I tend to go for turn-based.
Most people just tend to play on Fox, OGS, KGS or some other server for real-time games, since finding games there is a lot easier.
edit:
Oh, and also the "points" you have in Elite-league are different to the ones you have before.
Once you reach Elite, it shows something more in line with an Elo-score, whereas before it is just "reach 10 points to get to the next tier!", so you will gain a lot "more points" then and also not start on 0. Think 1500 is the base, but I can't say for sure, as I said earlier, not really an expert in the implementation of Arena here.
