I personally think that the new locks and actions are unecessarily complicated attempts to re-invent the locking-liner format, and miss the mark every time.
The most meaningful innovation is being done in the areas of design for utility, the application of modern materials, and the precise engineering of construction and movement.
I think these are the leaders:
Darrel Ralph, for making the folder a precision-made tool, and for extremely compelling, useful designs.
Tom Mayo, for exquisite handmade workmanship and the application of modern materials into inspired, spare, designs.
Rob Simonich, for the introduction and development of modern materials to the hard-working utility knife.
Jerry Hossom doesn't make folders, as far as I know, yet his work is being adapted to folder blades everywhere. The glossy magazines are always informing us who is "on the cutting-edge" of the knife world. Jerry is actually working on the cutting edge <i>of the knife blade.</i> No one studies this more than he, and he is discovering important things about how to design, construct and grind a sharp edge that cuts and endures. He could easily keep it all to himself, but would rather be known as the guy who did not do so.
I am, merely, a knife enthusiast and not a collector. If I was committed to building a valuable collection I would first buy an example of the best work by each of these makers before anything else. I think that would prove to be the basis of a very valuable and telling knife collection.