I've just seen two 'Xmas' promotions one in a UK site saying about a free extra battery and props. Another in France saying about the extra battery at half price and free props. These are the same products and price that they have been at for some weeks - no special offer that I can see. The only Xmas thing is a bit of decoration in the advert.
Here's a Xmas goodwill project on sales from DJI. I have a Phantom 2 Vision and it works OK. I am/was thinking of getting the Phantom 2 Vision + Version 3 with the extra battery. Now if you (DJI) send it too me - I'll test it out and do a few flights and if it's OK - I'll pay for it - if it doesn't perform - I'll send it back. Can't say fairer than that eh!