I suspect that it's that Glacier bot release which will be FansProject's first product that isn't directly based on Transformers characters. Their first fully original toy characters.

As much as I would love a Constructicon Maximus upgrade, I doubt it would happen as that mold doesn't really allow much room to work with. Where do you incorporate the 6th Constructicon in the design? It works with Bruticus Maximus as he is originally a 5 team Scramble city combiner and that is what the Energon combiners are directly based on but not 6.

The only way that I can think of an upgrade for Constructicon Maximus is if the '6th' Constructicon ends up being a parts former which disassembles to add the extra bits on the combiner (new head, hands, feet, etc) but that would severely compromise the figure's design.