For me I would like to see a few things as well
1. Be able to customize the statements like you can with the invoices/quotes to add info on it like payments etc.
2. incorporate BAS for Australian users
3. be able to export out you things like customer lists, items etc.
4. able to restore both the old data from express invoice and express accounts into the new express accounts without data loss
there is probably more but I cant think of at the moment
Graham