Well... My GSOC project for this year, entitled Comprehensive Comprehensions, is going to be wrapping up here soon.
These are the extended for comprehensions that you described a few episodes ago.
I've got a working build with pretty-much-done code (and a build) up at https://scala-comprehensions.org
and I'm in the process of posting documentation. I will likely have another post up on the site by the time you start the show and a post on scala-sips in the next couple days.
Because 2.11 is so far along, these changes won't be in a release for a very long time (if ever, since I am not the one who decides that), so community feedback will have a strong pull on the future of this feature.