I'm just wondering... has there been any significant improvement in twintip design / materials in the last few years?

I'm still riding a 2006 cardboard which is going strong and no need to replace really. The general shape is very similar to a lot of new boards, and i gather materials also similar (paulonia wood core) But new stuff is cool...

a year or two after i bought my board a lot of twintips appeared with raised layers on the deck (not sure what this is called), this design seems to have stuck around, whats it do and am i missing anything? extra rail bite / upwind ability perhaps?

Also i notice many TTs these days have sharp corners on the fins. seems unnecessary, is there any real reason for this?