Yeah... I think because these two were leaked in the last few days, Hasbro has rushed out their official reveal (if they are two of the five planned reveals for Tuesdays).

This (Singapore?) website appears to have been given samples of the two toys, to reveal... and with a number of sites also having pre-order listings now active, I don't think Hasbro had much go according to plan on the reveal of these two.
Both are listed for release in December, for US$30 in America.

WFC-GS14 Megatron (Gen2)
Transformers Generations Selects bring back favorite characters from across the globe as exciting entrants into the Cybertronian Wars. This WFC-GS14 Megatron figure is inspired by the 1992 G2 toy release. Big robots join the Siege with this Transformers Generations Selects Voyager G2 Megatron – Exclusive! Figure is compatible with blast effect accessories (sold with Battle Masters figures, sold separately.) Decepticon warlord transforms from tank to a robot with a fusion cannon and battle sword. Blue Purple and green deco inspired by the famous Hasbro Generation 2 tank Megatron toy from the 1990s.

WFC-GS21 Sandstorm (Gen2)
Starscream’s mean team is on the scene! Check out this amazing 7-inch Decepticon G2 Sandstorm figure. This Decepticon Sandstorm figure features classic conversion from robot to Cybertronian jet modes and is based jet to a highly detailed robot. Inspired by the mockup of the never released G2 Decepticon Sandstorm figure from the 90s, this figure has a cone head and will look awesome as a part of your growing Seekers squad. WFC-GS21 Sandstorm includes two blasters and instructions.It’s the G2 Sandstorm figure fans have been waiting for! For the first time ever, fans can add the elusive character to their collection! This special edition WFC-GS21 Decepticon Sandstorm figure is inspired by the mockup of the never released G2 figure, featuring desert camo deco and a ferocious snarling face on the nose of the jet mode. This Decepticon Sandstorm figure converts from robot to jet mode in 25 steps and comes with 2 null ray accessories that can attach to the figure in robot and jet modes.

Both are Voyager redecos - new head for Megatron... I can't see anything obvious for Sandstorm.