Adobe has just announced Adobe Acrobat 9. It new comes in three versions, Acrobat 9 Standard (Windows only), Acrobat 9 Pro (Mac and Windows), and Acrobat 9 Pro Extended (Windows only). From what I've seen, this appears to be a feature-rich, important update. Among other features, this version of Acrobat includes built-in support for Adobe Flash files within a PDF. I'll blog further about the new capabilities of Acrobat 9 in the near future.
If you own Creative Suite 3, and you want to upgrade to Acrobat 9 now instead of waiting for the next major release of the Creative Suite, you can upgrade to Creative Suite 3.3, which includes Acrobat 9.
According to Adobe, Acrobat 9 will ship in July.