WP-Premium theme – should I improve it with new features?

I released the famous wp-premium theme in December 2007 and everyone loved it. It was also mentioned in smashing magazine and is being used by hundreds of users now.

Now that I am back to my freelance career, I just thought why not improve wp-premium themes with some cool features, color schemes, 2.7 compatibility and all? But I would like to ask the user first about this. As a wp-premium user, do you think it should be improved? If yes, can you please suggest features, thoughts in this post via comment?

Oh by the way, should there be a paid version of the theme as well? And if yes, how much would you like to pay for it?