The wave 4 Legion figure, Soundwave, is expected to be released by October, and Hasbro have put up official pics and the bio on their main Transformers site.

Bio:

From the ground, SOUNDWAVE does not have the total access granted by orbit, but the high top speed of his new vehicle mode allows him to intercept and interfere with AUTOBOT communication like never before.
Its speed versus skill with this detailed SOUNDWAVE robot-to-vehicle figure! When this bot detects the slightest interference, convert him into MERCEDES–BENZ SLB mode for “crushing” velocity. Will it be enough to defeat his AUTOBOT enemies? Their fate is yours to decide!