Straight from the stream from Cologne, Germany (which I missed) and then from the Gfinity news announcement the new Esports features for BO3 were releasd to the public.
As prophesised, MLG will be taking Black Ops 3 to the Playstation 4. (Seems sony has more green than microsoft). The Playstation is now the "Home of call of duty esports". Which seems to have been inevitable.
Both CodCaster will return for a 4th succeeding year and League play will return with a rename of "Arena" with rank being based on WINS only. Back-to-back chain wins boost your rank. But two-consecutive losses will cost you your rank.
Basketball Uplink is going to return in Black Ops 3 after a well received introduction in Advanced Warfare.
Treyarch have introduced a pick and ban system to competitive BO3. Meaning teams can remove or keep degenerate weapons or perks from/in the match.
Source official Call Of Duty site.