If by changes, you mean catching up with competitors yes..
we got life folders - WOW..
we got a actioncenter - WOOOOW..
we got a data toggle - dude, you're kidding me right?
I dont think the UI should be different. I mean it should change the way ios7 and LP did. Add more soft colors like in Android, add this MixView sh*t, add more and fluid animation, change the icons, add more function to these useless Live Tiles (yes they are useless). So much stuff can be done yet staying with the roots of Metro and typografy.
And to those that continue to blow the trumpet all the way around, saying that ios and LP copied Windows Phone with the flatterend design, well at least they managed to made it look beautiful and warm. This metro thing looks ok on paper, on underground signs and so on, but on digital this isnt the case. Apple and Google realized that, and made it right. FLAT != METRO, know your facts. Apple and Google are flat, meaning no skeumorphism and gradients, while using warm colors and informative iconst. Microsoft is Metro, which is infographic oriented design and fonts. The last gets boring quickly, because it is no fun, meaning consumers get bored. Static grid of icons is still functional and fun when it is made right. Microsoft should differentiate with Tiles, but make them more FUN and user friendly, by adding tons of feautures (some of them i just mentioned). iOS and Android are successful, not only because of the apps and the ecosystem, but because Apple knows it needs to bring the sex-factor in their products. Google is starting to realize this too. Only Microsoft is wood. People love what they see at first glance, then come the functional features. Yes, you want the job done with your device, but that is not what attracts consumers. They want animations, tweaks and awesome UI. WP UI is functional and business, and thats why its a niche and noone buys it (and thats why noone wants to write apps for it), while iOS and Lollipop (recently) are sexy and successful.
Conclusion: Stay with tiles and typography, but overhaul the whole UI from the scratch with the cool factor.
I am WP user.