Gmail will have
- most recently starred emails show up in a separate box on the top
- an embedded calendar widget that'll help me remember pending emails, emails to follow-up on, and emails labelled as "action items"
- the ability to label emails in one click
- a customizable layout that'll allow me to place my Labels above the Chat list
- the ability to label draft emails before they get sent
- and also, the ability to click on any label on an email in the conversation list which will take me to all the emails with that label.
Yea, all these features will definitely make my Gmail experience more fun and perhaps almost complete :)