From what i have seen not all spells are projectile. Some seem to instantly hit. I would also imagine the timing to dodge an attack would not make it possible to dodge every attack. Plus its not just ranged attacks, with proper timing you can roll away from a melee attack aswell. Though it would still be easier to dodge ranged.
---------- Post added 2011-06-09 at 06:25 PM ----------
Afraid all we got right now is second half of the year. I would assume a beta announcement at Pax which is in August.