i looked into the pics as well...i don't see many things changed from the spec 2 tz

the crancshaft seems improved and balanced
the head seems to be aluminum but with holes for loss of weight
piston and sleeve look to me like the same as the speed 2 tz
rear bearing is absolutely ceramic!

so if things are like that , we have a spec 2 with a better crancshaft"(very important),better head which means better engine cooling ,so we'll wait to learn about the piston / sleeve difference to find out the overall imorovent.

i hope they finally changed that rod!!!
i' ll get myself one for sure!!!