Heard about the rumors for quite some time now, but seems that it's not a rumor anymore: Megatron's second in command, Starscream will get his Leader Class treatment. ^^
A photo of his prototype is up:
Plenty of details on the chest panels. ^^
Release info N/A at the moment.
Image from TFW2005
On the other hand, large images of another Leader Class action figure - RA-24 Buster Optimus Prime:
Late November release, 7,800 Yen (exclusive of tax).
Images from Hobby Search
Finally, San Diego Comic Con 2009 reveals an array of future Transformers releases:
(Movie) Brakedown, Skystalker
(Movie) Scattershot, Ratchet
(Movie) Lockdown, Dirge
(Movie) Brawn, Mindwipe
(Movie) Jungle Attack Ironhide, Bludgeon
(Movie) Human Alliance Barricade with Frenzy, Human Alliance Mudflap & Cycle with Simmons.
(Animated) Arcee, Cybertronian Mode Ratchet
(Animated) Fugitive Waspinator, Cybertronian Mode Ironhide
(Animated) Rodimus Minor, Goldfire Grimlock
(Animated) Hydrodive Bumblebee, Blackout
(Animated) Wingblade Optimus
Images from TFW2005.