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Yes it the game will have a whole new interface.
We are still working on artwork, colors, font, etc for the new interface.

will there be an option to change between dark and light? Or at least have a more consistent theme? Jumping from the dark blue of the main screen to the bright white of open arena isn't going to be pleasant on the eyes when the sun is down :(

Well colors/ graphics have not been implemented yet.
The screenshot is just for testing our code and doing a basic layout.

On the dark / light option. I had not even considered it.
I will put it on our list. From what it looks like it takes a little JS / CSS to implement.