We are working to get this release out ASAP. Our hope is to release it this week and release notes provide what has been added. One notably improvement is when creating iSCSI Volumes it will create the Target for you if you select the option.
Some users are seeing performance improvements - see budys comments from this post.
Concerning the IOAT Intel drivers don't support I/O AT in the 32bit system any more, we don’t make the drivers. Now the new Atlanta release will default to 64bit mode so you should be able to use this feature. We only have in our labs the SSR212 systems to test with.