I know it is works in progress, but how about moving tabs right of file browser 1st (something that many ppl have requested so far)?
I really find new bar and tabs above awkward, also against HIG since switching tab has absolutely no impact on file browser:


Btw it doesn't look like on: https://github.com/textmate/textmate/wiki/Main-Window The bar is much darker and higher in the build.

How about making the bar same size as tabs bar too:


Cheers,
-- 
Adam