One of the great things about Report Builder is being able to copy multiple requests into a new worksheet and then edit the report suite or date range on all of them.
The above is particularly useful when you are having to report across different sites e.g. for multiple markets as it is extremely quick to roll out once the additional requests have been created (simply by editing by group).
The ability to segment in Site Catalyst is a huge step forward and this functionality is now available via RB version 4.2. However if I create e.g. 20 requests all with a certain segment e.g. New Visitors, I have no easy way to copy these 20 requests and change the segment on them all at once e.g. Returning Visitors. You would have to either recreate all the requests or copy them and individually change the segment applied.
I think the ability to change the segment on multiple requests at once is a great idea for Report Builder and will help save time/increase efficiency on report production.