Details on some of the bugs that are targeted for Ubuntu 10.04.1 can be found on the Launchpad Milestone. However, as Ubuntu 10.04.1 did not have a full-time release manager, the release has been pushed back from the 29th of July to the 12th of August. This delay provides an extra week to incorporate additional bug-fixes and then another week for testing.
Fortunately, this setback for Ubuntu 10.04.1 will not affect Ubuntu 10.10, which is scheduled to be released on the 10th of October.
Robbie's Ubuntu 10.04.1 update can be found on ubuntu-devel.