Missy Hatch of EA Mythic Entertainment has put out a very nice Beta test review of the Empire vs Chaos tests done over the last few months.
In an 'in character style' she manages to relate a lot about the atmosphere of the game, blending lore and mechanics in a good to read, easy to understand and yet lengthy and thorough article.
Of note are the unveiling of several masteries:
Bright Wizard Masteries
Warrior Priest Masteries
Chosen Masteries
Zealot Masteries
And some details on Siege gameplay, but for that you're probably better of checking out the Special Feature on the subject over at the main Warhammer Online site.
