The only thing that I do not like, is that it appears that wizards will only learn new spells by leveling. So they completely lost their "learn from scrolls and prepare what you wish" flavor. Hmm they are basically sorcerers now, but probably with even less spells known(compared to 3.5 sorcerers) as they get more levels.

Although I may be wrong, that spellbook ability seems as it could be expended in ways other then leveling.