Thanks for the kind words
Anyway...
Character generation is slightly different (with humans, elves, and dwarves being the playable races) ...though it would probably be best just to skim through the condensed character generation rules to get a taste of how it works (though it's still very similar to OQ).
There are also lots of little changes here and there (actions in combat have been grouped into Combat Actions, Movement actions, and Reactions, for example), but the main difference is how magic works (it's also not so prevalent).
In AoS, magic is split into 'innate magic' and 'sorcery.' Innate magic is only really available to elvish characters (or humans with some elvish ancestry), and is derived from the inherent power contained within the individual. Sorcery, on the other hand, draws upon the fabric of the world itself (which unfortunately, has been tainted by the 'dark powers'), and as such, can be corrupting. Though they are, in essence, still 'battle magic' and 'sorcery' - but with some tweaks.
The monster section is new too, though OQ has been used for a baseline from which to work.
Anyway, the motivation behind these changes was to make a system with more of a 'Middle Earth' feel to it, and a 'First Age' one at that (and not because I thought OQ was itself lacking). It's really as simple as that (oh and because I'm rather fond of OQ too).