The most recent changes that come to mind are the improved spindle motor and the hardened ER-16 spindle. I think the ER-16 spindle is the most valuable of those two mods (as a user could add a better motor) but the motor is a great addition too.
There have also been recent(ish) changes in the lathe kit. It is now even easier to assemble.
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Happy Machining!
Jeff Birt - Soigeneris.com
Proud Dealer of Taig, Precisebits, Gecko 540,
SmoothStepper and A2ZCNC products.