Finally some actual images from the cartoon, and it is only four days away... and after a year since its announcement.
The regular "series" starts August 2nd, but a four episode prelude begins June 28th.

Transformers: Combiner Wars, a new animated series debuting August 2nd on social entertainment platform go90 in the US, AMC Networks International Iberia in Spain and Portugal and in other territories to be announced at a later date.

Additionally, Davis and Gutstein announced that a prelude series to Transformers: Combiner Wars will launch on June 28 on YouTube, Facebook and go90. The four-episode Prelude to the Combiner Wars will help prepare fans for the full series by revealing the current state of Cybertron from the distinctive points-of-view of four characters.
As noted already, these are only 8 minute episodes, so probably not a lot will happen in each one. (not even enough to be combined to be "movie length" )

A shame about Windblade (the new Drift) getting the spotlight in yet another project. Can't she be just a backing character, or not be included at all in something at the moment... we are even going to have a second SDCC Windblade toy in two years.