I picked up a copy of 2e at Gen Con a week ago and have briefly read through it.
As far as I have seen there are no real changes from the AE rules, just a few more spells, combat manoeuvres and quick npc stats.
The tables are clearer and the combat chapter has all the relevent info condensed into one single chapter such as a condition summary ,heat,cold,falling damage and the like, making for less time having to look up things in other chapters, books etc.
As a final summary, the chapter layout is clearer than AE,1E and contains a lot more info in a single book, making it great for newcomers to Conan but if one already has AE,the Hyboria's F collection , road of kings and 3.5 core rule book like me, then one may be disappointed as there is little new to see.
P.S I have not read it cover to cover so this is a rough impression.