I saw this first at Mykres Space, but it’s out now. More info at this XNA Team Blog post.
We’ve gone over many of the features outlined in the announcement we made at GDC 2007. One thing we didn’t really cover previously is compatibility. The entire team made a conscious effort to maintain compatibility with this release.
- Your game should just recompile in 1.0 Refresh with no changes required.
- Any game that is compiled should run fine if you have 1.0 Refresh installed.
- As mentioned, you can continue to use 1.0 on your Windows computer with 1.0 Refresh on the Xbox 360 console.
- Games that are built on 1.0 Refresh may run on 1.0; however, if you are using new functions or features in the XNA Framework (such as font functionality), it will not work properly.
I particularly like this bit…
Your game should just recompile in 1.0 Refresh with no changes required.
Go here to download it. The runtime “redistributable” is also available here.
So, I guess I should get busy and re-release “Sharky’s Air Legends” for the new XNA (although it might just work regardless). Tis a shame as I was in the middle of a pretty cool new feature too. I just hope I haven’t broken too much to prevent me re-releasing real soon. 
Stay tuned.
p.s. Today (25 April) is “ANZAC day” here in New Zealand, Australia & I think some Pacific islands too. Go the ANZACS, you’ll never be forgotten!