There aren’t any immediate plans to rework the shop that I am aware of.
Also, patch notes have more information on Flash Sales:
These offers have limitless variety, but initially will focus in 3 areas:
o Troop Upgrade – These offers give resources to assist in upgrading Legendary and Mythic troops.
o Gem Deals – These offers are extremely high value, and may only be purchased in limited quantities.
o Weapon Packs – These offers give a weapons, and the resources to temper it, to beginner players."