The first of the toy reveals occurred today at the BotCon website, which will show off the five Boxset figures (and suggests that pre-registration is very soon, as it often starts during or just after the five toys are revealed on their site).
The first one is Hoist, which is the robot mode they featured on their site as part of the Machine Wars Theme/Logo of the convention this year.
And as people have already worked out, it is a black and brown redeco of Generations Kup, with a new head.
As the other four are revealed, they'll be added to this topic (and to this first post so that they don't get buried in pages of comments).
Toy 1 - Deluxe Hoist (redeco classicverse Kup - new head)
Toy 2 - Deluxe Skywarp (redeco movie Dirge - new head)
Toy 3 - Dexluxe Strika (redeco classicverse Warpath - new head)
Toy 4 - Voyager Obsidian (redeco movie Highbrow - new head)
Toy 5 - Voyager Megaplex (redeco TFPrime Dreadwing)