I would love to have an icon or a small preview on the Open Recent files. I think it will be a great feature and should be easily added to the final version.
That's a great idea.
Unfortunately, I would say it's HIGHLY unlikely they'll make a visible functional change between what we see in the beta and what gets released. I think they're well into the phases "features are frozen" and "if it's not a screaming panic bug we're going to wait to fix it in an update".
We love to hear your feedback, but as Noel stated, we can't just keep adding stuff to a stable release and try to break it at the last minute by loading it up with new features. We would like to ensure it has no killer bugs, but it will look pretty much like you see it upon releas (but with a normal splash screen instead of the cat).
We appreciate your feedback and great ideas. New features will be considered for a future version of the program.