The Comet Trio is not a development of the Comet. Totally different boats, different sizes, different sails etc. They ARE produced by the same people, and so may have the same design philosophy.
Other classes are developing: look through Y and Ying and you will see new sails in modern materials for Scorpions, Graduates, Fireballs, Streakers etc.
In the Wayfarer, the developments have been around the hull, for the past 25 years or more – making it easier to look at, look after, build, sail, drain, sleep in, launch the spinnaker, motor, cruise, race etc. – but not all of those options in the one version!