The font on Emotion 3.0 is different, and we can assume other changes are in place as well, such as transitions. When you compare this to the previous iteration of Emotion, you can see the more pastel-like colors used on the newer UI.
Since this is just a leak, we don't have any official word on when we might see Emotion 3.0 UI first in use on a Huawei device. Looking at the size of the Settings page, this could be for a large-screened flagship model. The recently released Huawei Honor 6 uses Emotion 2.3 UI.
eaked images of Huawei's Emotion 3.0 U
source: Weibo via GSMDome