Many changes are coming to the Sorcerer class in TERA with the Spellbound update, which will release in a few weeks. Besides the Sorcerer revamp, the update also brings two new dungeons and more, so you should keep an eye out for the Spellbound page for new reveals every Thursday.
So far, we only know about the revamped Sorcerer class, which includes new skills and new mechanics. Some of them are the Lightning Strike, which replaces the Magma Bomb, or the Frost Sphere that is now in place of the Ice Needle.
Here is a video from the revamped Sorcered in the Korean version.