I guess I haven't seen a development roadmap or anything so maybe these have been covered...

I've had a few users move over to roundcube from squirrelmail and the results were mostly favorable, but there were a couple features they whined for.

Auto refresh of the box you are looking so you can see if you have any new emails. Message filtering: w/o having to resort to procmail.

Thanks to all the devs for the great product.

Rob