Via Hasbro Pulse: PulseCon. Since San Diego and New York events were skipped by Hasbro, they're running panels Friday and Saturday from 11:00 AM to 4:00 PM Eastern, with product going on sale at 5:00 PM. Exclusive product will only be on Pulse, but you can get other stuff elsewhere.
Speculation has it that new HasLab items will be revealed or teased today, including the worst-kept-secret, The Black Series Rancor monster creature.
For non-exclusive items, consider affiliate/advertiser Entertainment Earth who will be offering free shipping on many of the new pre-orders. Keep an eye on that link for today's new reveals, which should include Star Wars, Power Rangers, Transformers, and... that may be it actually. Theoretically your other favorite online stores will also be putting these up today as well, but they don't pay me, so they don't get a link. Sorry, I don't make the rules. (Actually I do.)