The first tweak is the interface for account entitlements as they will no longer arrive by in-game mail. The team also changed the scenario line-up.
You no longer need to worry about losing your account entitlements because the in-game mail got deleted. The new interface lets you claim your rewards at any time without hassle, and more importantly without the need to contact EA customer support.
Also they’re adjusting the scenarios and when they will be available for each Tier. While the structure of them hasn’t altered what’s actually available has in some cases. For more on Warhammer Online’s New Year resolutions check out the official website.