A good example would be the capabilities of AG2 compared to the new AG3. Gonna quote Strop for a sec:
The AG2 forum code was very messy as it was a hastily thrown-together home-grown bunch of scripts. As a result, the forum tended to lag greatly and was quite unable to do many functions considered ordinary on other boards. Others were removed to preserve performance. [...]
So AG3's job is to:
--Increase the capabilities of the system
--Provide some great, new features that have been discussed, but couldn't be added throughout AG2's lifetime.
--Provide some great, new features that haven't.
--With some features, increase the activity that a user can do with flash gaming.
It is a complete overhaul on the system, and it's just going to overall be better.