Info from Hasbro Panel:
The show debuts March 14th (back to back episodes) on Cartoon Network
There will be a McDonalds promotion
Legion wave 3 includes Fixit and Underbite
1 step Drift, Thunderhoof, Fracture revealed
Warriors Sideswipe and Jazz revealed: Jazz is very G1 looking.
3 Step Steeljaw revealed
Deployers: Drift and Fracture will be released fall 2015, but their show debut is episode 12. They can launch the minicons.
Minicons: These are sold as single packs. 8 were shown but only a few names were revealed. Drift goes with Jetstorm and Slipstream while Fracture goes with Airrazor. Beast Box is another confirmed name. The Mini-Con single packs feature clear, removable peg armors.
Mega Optimus: can hold 10 minicons.
Super Bumblebee revealed: Biggest Bumblebee toy ever released.
Here are all the pictures from the event displaying everything written above.