Source: 
http://worldoftanks.com/en/news/17/86-update-brings-50-discount-premium-consumables/
Thanks to Steiner011(EU) for bringing this up.

Basically, the consumable price will be cut in half in 0.8.6 – but beware, it’s not forever, only until the 0.8.7 (this is a bit of a trolling from WG, because 0.8.7 will contain British arty and will allegedly come very soon after 0.8.6).

Keep in mind that selling prices will be cut in half also, eg. if you have gold consumables now and want to get rid of them, do that before 0.8.6 comes out.
有消息称!,086的金币给养的银币售价会半价,但是请注意,仅限086,到了087就又恢复了!!!???