Included in plans:
You can now completely turn off type inference and explicitly declare the type of variable or constant every time you convert your Objective-C code to Swift.
NSString *myUserName = @"Swiftify";
Converted Swift code with this option turned on:
var myUserName: String = "Swiftify"
Converted Swift code with this option turned off:
var myUserName = "Swiftify"
To toggle this feature open Preferences (⌘+,) => Converter and toggle the corresponding checkbox: