Here are a few really interesting differences between 3.5 classes and Pathfinder:
1) Barbarians - "Remove illiteracy from your barbarian. Enjoy books."
I'm not exactly sure how I feel about this one. What makes a barbarian a barbarian? The fact that they come from a cultured tribe that just gets angry quickly? This seems a little off to me. I understand that you can have intelligent barbarians and that not every barbarian should be illiterate. However, that's when a player buys a rank in Linguistics.
Here's the description from page 31:
"For some, there is only rage. In the ways of their people,
in the fury of their passion, in the howl of battle, conf lict
is all these brutal souls know. Savages, hired muscle,
masters of vicious martial techniques, they are not soldiers
or professional warriors—they are the battle possessed,
creatures of slaughter and spirits of war. Known as
barbarians, these warmongers know little of training,
preparation, or the rules of warfare; for them, only
the moment exists, with the foes that stand before
them and the knowledge that the next moment
might hold their death."
Oh yeah, and while these "savages" are tapping into their "vicious marital techniques," they took the time to teach reading and writing. Imagine how many pencils were snapped in the rage of trying to write a cursive capital "Q." I'm not digging this new rule.
The point of the illiteracy rule was to demonstrate the type of culture barbarians come from. They are a tribal people that rely on an oral tradition to pass down their stories; stories of their warrior heroes and the gods. This is EXACTLY like the Anglo-Saxons, who, as far as we know, were for the most part illiterate. All records of Anglo-Saxon stories were recorded by Christian monks--the very people who the Anglo-Saxons attacked. The same goes for the Visigoths who sacked Rome.
Barbarians are not any worse off for being illiterate. Their culture reveres the oral stories because the oral narration is the vehicle by which their fame spreads far and wide. Many bards rely on the stories passed down from the barbarian cultures to the extreme north and south--those stories are vibrant; full of battle, passion, gods, and glory.
If I run a Pathfinder campaign I'm not adopting this rule. It doesn't hurt the barbarian character whatsoever as far as combat is concerned, but I do believe it takes away from the role-playing color.