Looking at the FAQ I've noticed theres four known classes, for the EP. However, they are either offensive warrior and defensive warrior or offensive mage and defensive mage. Will it be possible to be a Spellsword or Battlemage?

Well gee I sure hope so, Battlemage's are one of the main staples in the elder scrolls series, to not have them would totally turn me off from playing this game...

they're just kind of like starting points. You can wear and use whatever you want.