Launch Watch App into middle view

WKInterfaceController's becomeCurrentPage() should be what you're looking for.

Let's create a new class for the center view controller, CenterPageViewController, and change its initWithContext: method as follows

import WatchKit

class CenterPageViewController: WKInterfaceController {

    override init(context: AnyObject?) {
        super.init(context: context)

        super.becomeCurrentPage()        
    }
} 

Now let's set the Custom Class for the middle page in your storyboard to CenterPageViewController

and finally hit run.

You won't be able to get rid of the initial transition from the left page to the center page, but the app will finally begin on the middle page.