The review of SE-0057 "Importing Objective-C Lightweight Generics" ran from Mar 31…Apr 5, 2016. The proposal has been *accepted*:
This proposal only received light commentary from the community, but that feedback was universally positive. The core team agrees that this is will greatly improve the expressivity of imported Objective-C APIs into Swift. The implementation work is quite far along, and while there are still a couple engineering-level questions left, the design is solid, so we are comfortable accepting it at this point.
Thank you to Doug Gregor for proposing this, and Chris Willmore, Jordan Rose, and Joe Groff for driving forward the implementation effort!