This is what some of the guys on rebelscum got from their vendor.
"Finally after a long long time wait this piece will be ready in Hong Kong any moment now. And we are hoping to receive the stock in Q1 2018.
Unfortunately due to the long time it takes for this helmet to be released, our supplier has increased the wholesale price quite a lot (it's due to EFX rises the price) which leaves we only have to increase the price as well. The new price for the helmet is £630.00 and we decide to apply 5% discount for all existing orders to make the new price at £598.50.
Could you please let me know by Wednesday 4pm, the 8th Nov 2017, if you accept the new updated price or want to cancel your order and refund of your deposit."
As some of them have pointed out it kinda seems like the "free" vader helmet wasn't so free after all.