Actually, the Pro Bundle doesn't include all our other upgrades just a selection of our most popular upgrades at a discounted price.
The Pro Bundle includes:
A Custom Domain (Either a new one or map one you already own). The Custom Design Upgrade - Fonts, Colours, CSS. VideoPress video hosting. Makes your site Ad-Free. An extra 10GB of storage for your images/videos.
http://store.wordpress.com/premium-upgrades/pro-bundle/
--
Here's what you can buy:
Pro Bundle (all upgrades in a single purchase)
Custom Domains
Custom Design
Premium Themes
VideoPress
Extra Storage
Ad-Free
Guided Transfer
Offsite Redirect