I think we have reached the point with Formula gear that discovering new things that really improve performance will not occur very often. Sometimes, manufacturers take a step backward with "new" designs simply because they feel compelled to produce something new every year and really don't have anything innovative enough to improve performance.
The good news is that there are plenty of old boards and sails out there that are really competitive. Good for the sailors, but not so good for the manufacturers.
Formula 160; iSonic 111; HiFly Move 105; Tiga 263; '85 Mistral Superlight.
Maui Sails TR 11.0; 9.2; 8.4; 7.6; 6.6; Maui Sails Switch 6.0; 5.2; Maui Sails Global 4.5; 4.0.