Not sure what you mean by "Winter screen pack".There are 3 variations of the "Winter Pack" available in the brochure, so it really depends on what exactly you have ordered, and for which model.
Bit more info?
Been some discussion about this on VW Audi Forums. Week 45 comment was there, only confusion is the Price List for the Estate came out yesterday and it is listing heated windscreen, but only for diesels. Haven't yet seen a revised PL for the Hatch.