here I am, back from the dead(I doubt anybody remembers me.) to post aobut this.
1. That truck ahs been confirmed to be in the movie, but hasn't been confirmed ot be Optimus. Think of it as a maybe.
2. That is not the original toy, that is a 100% completely different toy that was put out in 2004 to commemerate the 20th anniversary of Transformers. It has a veyr large amount of articulation, a huge amount of detail, and as close to a cartoon accurate robot mode as possible for a transformign toy. Due to the oddities in the original cartoon's art(Go watch sonme of the episodes if you haven't in a while. consistancy... did not exist.), it's impossible to have a 100% accurate toy resembling the cartoon version's robot mode while being able to transform.
3. If that is optimus, it's not the first time he's been a long nose truck. he was one back in 1994 and in 2002. the 2002 optimus was an alternate universe one from a series that is best left alone. it was really, really, really bad. so bad that when it aired in japan(Came to the US first at the insistance of Cartoon Network), they had ot fix the animation and plot in some cases.
http://www.transformerland.com/g1/prime-thumbs/g2-laser-rod.jpg Laser Optimus prime(the 1994 one)'s vehicle mode from the side.
http://www.toyarchive.com/STAForSale/NEW2001+/TF/Toys/G2/OptimusLaserRod1a.jpg his robot mode without stickers put on.
http://home.att.ne.jp/apple/ocharuribon/TF A-O.Prime 01.jpg The 2002 optimus' vehicle mode(Took a while to find due to the fact that a smaller Optimus prime was released in the same line that looks almost identical to him, albiet without a trailor, and with far more articulation. looked more like the animation model as well.)
http://www.toysrus.co.uk/Content/Product/products2/286281_m.jpg picture of his robot mode. He has a "super mode", but I don't see a reason to post it if unless somebody wants to see it.
Edit: here's the original Optimus Prime's robot mode, incase anybody is curious:
http://www.hogwild.net/images/Misc/optimus.prime.jpg