Xcode 7 beta 5 release notes mention Dictionary's removeAtIndex method now returns a key/value tuple pair rather than Void. removeAtIndex takes a parameter of type DictionaryIndex which can be accessed using Dictionary's indexForKey method.

Example:

var aDictionary = [
    "aKey"      : "foo",
    "anotherKey": "bar",
]

if let aDictionaryIndex = aDictionary.indexForKey("anotherKey") {
    // This will remove the key/value pair from the dictionary and return it as a tuple pair.
    let (key, value) = aDictionary.removeAtIndex(aDictionaryIndex)
    print(key) // anotherKey
    print(value) // bar
}