So far it seems to be just a UI change, it links tips for doing better(EX. Levelcapgaming's tank tips).
News for BF1 and estimated time for leveling up in battlefield 4
it looks much better in my opinion
Its much easier on the eyes
It also has message of the day(it says "Happy Friday")
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Once BF1 comes out, you'll be able to seamlessly switch between BF1, BF4, and Hardline. Idk how they're gonna do it but I'm excited. Also I keep going to the BF1 menu just to listen to the theme...