User blog comment:Rupert Giles/Global Navigation Update/@comment-10507735-20141203174136/@comment-452-20141203224724

Facts:
 * The old bar was 34px tall, with a 3px border above it (I still have an old tab open)
 * The new bar is 56px tall, with a 1px border under it
 * 34*2 = 68
 * 56 < 68
 * The new bar is less than twice as tall

If it is taller than 56px for you, then it is a bug.