New Twitter app. Best WP8 app, but...
It looks totally different. The design is better than in all other WP8 apps which looks basically the same.
I think that uniform design of all WP apps has its advantages, but also limitations. Every app is different and sometimes totally different UI is essential. WP apps can be boring because of that, but I hope that differentiation will come and we will see more and more quality apps with fresh design in the future.
PS: Native FB app is NEEDED! Current FB app is shit.
What are your impressions about uniformity of the WP app design?