I have just placed a document in the Document Library for the 7.5.1 release of Ascential DataStage. It is an update to the 7.5 document so it includes the 7.0.1, 7.1, 7.5, and 7.5.1 releases. It is inclusive of all DataStage products: DataStage, DataStage Enterprise Edition, DataStage Enterprise MVS Edition, and the new DataStage Enterprise USS Edition.
The 7.5.1 release of Windows is available today. AIX, Solaris, and USS are planned to rollout in the next week or so. The other platforms (and check out the new! platforms) will rollout in March.
If you have questions about the release, please post them here or contact me directly.