ok so from what I've seen Optimus in the 3 trailers releases so far is in his knight mode, as can be seen by his gauntlets or different forearms he gains from when he grabs the sword, so got me thinking, when he grabbed that sword.....it was to help his friends, and that look he gave grimlock.....was he sacrificing something? Did he know what was coming (the planet thing) hence why he left earth so abruptly?? Also worth noting.....has anyone else noticed that we haven't seen his alt mode pretty much at all......did he sacrifice his current self to save his friends?? Also what if the redesign of Optimus without much vehicle kibble combined with the red is because he's in knight mode.....all knights as is stated in the app and can be seen in their alt modes.....all were immediately derived from and followed the beasts era on cybertron...... So did Optimus choose to 'de-evolve' and is going through a primal rage and what we're seeing is him in some fashion bringing about a beast at mode, especially if this is something tied in with being a knight and he seems to be in knight mode in all footage we have seen so far. This could also explain the red marks on him and megatron.....maybe it happens to him too somehow "No sacrifice no victory"