The thing about these listed items is that most of their release dates are set to be in late May. The dates are for the Japanese market I think, as many overseas fans must have been twisting and transforming these new toys since many many weeks ago. :D
Many review videos are now up on Youtube, like the one for Leader Class Optimus Prime mentioned yesterday.
Speaking of the "classes" for these merchandises, they are missing for the listing on Amazon Japan. But I believe you can have a rough guess from their images as well as their prices.
RA-01 Optimus Prime - Late May release, 7,140 Yen (inclusive of tax).
RA-02 Ironhide - Late May release, 3,990 Yen (inclusive of tax).
RA-03 Bumblebee - Late May release, 2,415 Yen (inclusive of tax).
RA-04 Sideswipe - Late May release, 2,415 Yen (inclusive of tax).
RA-05 Autobots Breakaway - Late May release, 2,415 Yen (inclusive of tax).
RA-06 Roll Bar - Late May release, 1,260 Yen (inclusive of tax).
RA-07 Autobot Knockout - Late May release, 1,260 Yen (inclusive of tax).
RA-08 Desert Tracker Ratchet - Late May release, 3,990 Yen (inclusive of tax). Image N/A
RA-09 Autobots Wheelie - Late May release, 2,415 Yen (inclusive of tax).
RA-10 Skids - Late May release, 2,415 Yen (inclusive of tax).
RA-11 Chromia - Late May release, 2,415 Yen (inclusive of tax). Image N/A
RA-12 Depthcharge - Late May release, 1,260 Yen (inclusive of tax). Image N/A
RD-01 Megatron - Late May release, 7,140 Yen (inclusive of tax). Image N/A
RD-02 Starscream - Late May release, 3,990 Yen (inclusive of tax).
RD-03 Demolisher - Late May release, 3,990 Yen (inclusive of tax).
RD-04 Soundwave - Late May release, 2,415 Yen (inclusive of tax).
RD-05 Sideways - Late May release, 2,415 Yen (inclusive of tax). Image N/A
RD-06 Rampage - Late May release, 2,415 Yen (inclusive of tax).
RD-07 Dead End - Late May release, 1,260 Yen (inclusive of tax).
RD-08 Dirt Boss - Late May release, 1,260 Yen (inclusive of tax).
RD-09 Ransack - Late May release, 1,260 Yen (inclusive of tax). Image N/A
Gravity Bots GB-01 Optimus Prime - Late May release, 2,415 Yen (inclusive of tax).
Gravity Bots GB-02 Bumblebee - Late May release, 2,415 Yen (inclusive of tax).
Gravity Bots GB-03 Starscream - Late May release, 2,415 Yen (inclusive of tax).
Gravity Bots GB-04 Sideswipe - Late May release, 2,415 Yen (inclusive of tax). Image N/A
Gravity Bots GB-05 Mudflap - Late May release, 2,415 Yen (inclusive of tax). Image N/A
Robo-Q T/F Optimus Prime - Late May release, 4,200 Yen (inclusive of tax).
Robo-Q T/F Bumblebee - Late May release, 4,200 Yen (inclusive of tax).
Some of the characters released as toys may not be appearing in the movie.
All images and information from Amazon Japan.