Max level's 270 for members (optional content), will be 235 soon for non-members, sectors range from 1 to 266 (non-members can clear the higher maps).
The sectors were swapped around a little bit so it tells a more clear story with the flavour text, and you get stronger when you level up, instead of stats being purely from the sets you wear.
Most of the sets you know are considered "old" and you'll probly outlevel them before you get a full set. We might do something about this in the near future.
A variety of new items, including a new coupon that lets you exchange items for other items, so you can customize your set (list of items that can do this fairly small).
Besides those things, it's generally similar-ish. The gameplay is the same, but weights are slightly different. You can't get full TD unless you're a patch, for example, and unlike the original BOTS, patches do more damage outside of trans while rams do more in it.
Coins are free, but we have a variety of cosmetic items you can pick up on the zylon shop. They're almost all tradeable if you'd prefer to buy from others.