Suggested code for fade-in of splash.

delegate_module.rb

    def open_screen(screen, args={})
      screen = screen.new if screen.respond_to?(:new)

      self.home_screen = screen

      self.window ||= self.ui_window.alloc.initWithFrame(UIScreen.mainScreen.bounds)
      self.window.rootViewController = (screen.navigationController || screen)

      splash_fade = args.respond_to?(:splash_fade)

      if splash_fade
        image = (568 == UIScreen.mainScreen.bounds.size.height) ? ("Default-568h") : ("Default")
        image_view = UIImageView.alloc.initWithImage(UIImage.imageNamed(image))
        @window.rootViewController.view.addSubview(image_view)
        @window.rootViewController.view.bringSubviewToFront(image_view)
      end

      self.window.makeKeyAndVisible

      if splash_fade
        # fade out splash image
        UIView.transitionWithView(@window, duration:splash_fade, options:UIViewAnimationOptionTransitionNone, animations: lambda {image_view.alpha = 0}, completion: lambda do |finished| 
          image_view.removeFromSuperview
          image_view = nil
        end) 
      end

      screen
    end
    alias :open :open_screen
    alias :open_root_screen :open_screen
    alias :home :open_screen

Looks pretty good! I'll make an issue.

EDIT: Looks like you already did: jamonholmgren/ProMotion#281