Look! It's a new version of Inform 7, and it's a doozy of an upgrade. Not quite as crazy a leap as Inform 7 itself, but still a massive update. There's a Linux version thanks to Adam Thornton, and it, the OS X, and Windows updates all were released simultaneously. 4S08 fixes all known bugs to date, and that's not the biggest news. The paragraph spacing engine has been tweaked, there's free-standing documentation that works better than screen readers, there's...I tell you what, just go read the changelog. Oh, and you'll need to update a lot of your extensions.