What Twitter is clearly doing is going for their own look, which is fine with Windows UI design principles (The user interface formerly known as Metro) as long as other considerations like navigation patterns and chrome reduction of visual element are still being followed. It's visually pretty much Twitter.com with a Windows Phone flavor.
There are still some curious choices so I decided to mess with the UI a little bit (a bit off topic I know but I kinda like the results):
CE
Changes:
- Top header size shrunk to a more standard size, the original one is a little imposing.
- Top header icons aligned to the grid
- Changed the name font to pop up little more from the rest of the text (I'm personally looking at the names when scrolling/browsing the tweets, this helps me to see better)
- Changed the text spacing to more closer (original one has the tweets in nice glance-sized bits, but I think it's currently a bit overkill)
- Got rid of that very redundant bird icon