I understand those are not your intentions, you are simply worried about loosing your money. Well, I would say if it really concerns you this much, cancel your order and then place it again when they have units ready to ship out.
It's what I surely will do because I don't think to receive it before the 45th day (20th january for me). I think the best is to mailing TET to explain my situation, and I will do what they think is better for them and me.
But I'm sure I'm not the only one who have paid by Paypal