Carlos wrote:My intuition insists their new direction will be a suspension development.
Well, my intuition was persuaded by your intuition. The engines are homologated (to a significant degree), the gearboxes are seamless shift (any further improvement would propably be in the lowest single hundreths of a second). Hardly a revolution there, then; if there is a comprehensive revolution, the design philosophy originates somewhere. Aero is an ongoing revolution following a curve that is more or less predictable. Of the major physical elements that leaves suspension.
If it isn't traditional double wishbone (with accompanying gimmickry), it's gonna affect everything else connected to it thus potentially forcing pretty significant changes on the vehicle itself. Basically there are two avenues of development I'm aware of that can be considered "passive enough" according to current F1 rules. (Both have been discussed here sporadically and it might well be that the links below are a repost. If so, sorry about that.)
1) New (or reapplied) mechanical multi-link systems
DAX (link) for example have their own innovation, the so called CC&AR (the camber compensation and anti-roll suspension system).

(
Edit: I can't get the image to load ... just browse the dax website)
Image routed from DAX website
For a huge database of different mechanical arrangements, visit Cornell Uni's
KMODDL (kinematic models for design digital library, link). It's pretty huge and takes getting used to getting around, but I guess Watt linkages aren't that hard to find for example. People have thought about these things, well
forever basically, so there's no shortage of ideas.
If one is serious about testing mechanical susp ideas,
multibody system simulation software (link) is one way to do that. Some commercial and some academic stuff in those links.