A report of a recent Activision Preview Event where Matt Tieger of Highmoon Studios showed off more of an early build of the upcoming game; Transformers: Fall of Cybertron, has been posted up on TFW2005.

As mentioned in Sol Fury's recount, there wasn't a great deal of anything not already known that was shown at said event; That is, with the exception of the 1st proper showing of Cliffjumper and his Level:
Moving along to the Autobots, the third segment of the presentation was Cliffjumper. Cliffjumper was shown in actual gameplay here for the first time, and he plays as a nimble character that is a bit less resistant to damage, unlike Vortex or Bruticus. Cliffjumper instead has a stealth mode, so he can go invisible and execute stealth kills on enemies. That seems to be the driving idea behind Cliffjumper’s stage - taking out opponents by stealth and cunning rather than in out-and-out firefights, though that is of course also available if that is more your style. Stealth kills look fun, and involve things like Cliffjumper leaping on an opponent’s shoulders before taking off their heads with his blade. The segment we were shown was Cliffjumper’s first battle with a new type of enemy, who is able to detect and jam Cliffjumper’s stealth mode. You have the option of dodging the enemy’s scans and taking it out stealthily, or if you are feeling brave you can take the thing on in a firefight - the balance of the fight meant that while it is a challenge to fight one-on-one, Cliffjumper is agile enough to evade his slower opponent and get a few hits in while it locks on and charges up its guns.

The other segment shown with Cliffjumper was the previously mentioned observatory sequence. Cliffjumper’s voice in this sequence seemed younger than Generation 1 or Prime Cliffjumper - I’d describe it as a mixture of Generation 1 Cliffjumper with a bit of Generation 1 Bumblebee’s voice. The voice fits the personality of the character and his playstyle, and it is not unreasonable to think that this character could mature into Generation 1 or Prime Cliffjumper over a few million years.
The full report can be viewed here, accompanied by a slew of Screenshots.