There probably won’t be a replacement announced for the 13.3″ Apple MacBook at tomorrow’s Apple event / announcement, but there will be quite a few other things (it was speculated that some Macs would receive updates, and MacBooks are definitely reaching an age where they are due for a new design).
Based on the invitations, it’s going to primarily be an iPod / iPhone event.
Apple Insider is claiming that among the announcements, iTunes 8, which could include HD content for TV shows (and possibly movies).
The thing I’m interested in, the iPhone 2.1 firmware could be released. It’s expected to add background push notifications for events to third-party applications as well as full directional GPS.
Read: Apple Insider