A change went into last night's build with regard to the update site. The features have been renamed, and the SDK feature has been removed. The SDK feature was just the regular feature plus the source feature, which was a bit redundant.
If you do not have the SDK feature installed then no action is needed on your part.
If you had the SDK feature installed, you will no longer see updates for it. You should uninstall it and then install both of the available EDT features:
EGL Web Developer Tools
EGL Web Developer Tools Source Code
I'm confused (though that's hardly new). When I went to download EDT following the standard instructions for EDT 0.7 M3, I saw the three categories, EDT, EDT SDK and EDT Source Code. All have version 0.7.0.v201110251332-etcetc.
What got renamed? Did I just download an out of date version?