If it is a new mold or not, the only real answer is the following: its a remold. Does that make it a new enough toy for you though? That will differ from each person. For example, you will notice from the toys below that although none share the same sculpt, they are all distinct toys from one another mold wise but many share the same transformation and thus make something that was already lackluster, even more of a dull experience:
Deep down, its all personal taste. While a toy may be new, the fact that it shares a similar transformation over another takes away the novelty of its transformation, so I am not really getting a new experience from what would be considered a new toy, and thus the value of the toy changes big time for me. I would feel I would want to pay less depending on how much I need the toy in my life and the fact that I dont experience a new transformation would take some value away (then again it may be that the deco makes the toy fit with my collection differently and thus changes the deco). People will have different opinions about that.
Also, to everyone saying there is now a leader Prime to match leader Megatron, these iterations never met nor fought against one another, so it wouldnt be a recreation of G1 (which it technically never was considering Megatron's alt mode). Instead it would simply be a new take on both characters in a new scale, which is what classics did all those years ago at the voyager scale.