No there isn't, not in the
Album and Tracks view. You would have to switch to the
Album Covers view if you want to resize the album artwork.
Edit:
...It currently feels like the tracks take too much horizontal space and the artwork is too small.
Also, there's a
wishlist board on this forum where you can freely make requests for things you'd like to see in the next MB versions.
(obviously, it's not every request that'll get addressed...but a large number are considered and implemented)