What difference would that make? I think they're being very careful about how they make changes these days- they're not going to rile up the natives by lying to your face or pretending they didn't tell you something.
It's not stealing- they're saying that you after 1 Jan. you have to use everything you accrue each year or you lose it when you quit. If you don't quit or get fired, you don't lose it. If you spend it all before you quit, you don't lose it. You still get everything you have saved up until 1 Jan, and everything you accrue in the year you leave.
It's all spelled out, and nothing is retroactive. No one will lose anything if they quit until 2018 at the earliest. What are they stealing, exactly?
Come on. What are you going to sue them for? You want a law that says companies have to pay you everything you accrue, period, end of story? What do you think that's going to do to the amount of PTO you get?
They aren't. Everything you've gotten, you keep. Next year, the "saving" part is conditional. It doesn't belong to you.