I can help you with that. It has been changed THREE times. Each time was to add restrictions which favor CIG over backers.
1. added arbitration clause
2. extended the refunds & accountability period from 12 to 18 months after failing to deliver on Nov 2014
I have it all documented - with links and context - in a new post right
here. Please bookmark.
In fact, in the past weeks, knowing that the Mar 31st deadline is looming, sources tell me that they are about to again update the ToS in order to take away even more rights from backers. In fact, that's precisely why I am now hearing that more resources have been allocated (taken off SQ42 btw) to making the PU 2.4x stable so that the public release can be used as a trojan horse for the ToS update.
Somehow, the evangelists are going to wave that one off.