MacRuby has been looking increasingly interesting lately as Laurent Sansonetti at Apple has rapidly built it into a quite performant, stable implementation. It runs on LLVM and is being included with XCode 4/Lion. Lion itself is switching heavily to LLVM, which almost certainly means iOS 5 will as well. The big question for WWDC is whether iOS 5 will get garbage collection, which looks to be the only remaining roadblock for MacRuby on iOS.

(Source: pogodan.com)