Manufacturing issues could explain the discontinuation of the iPhone 5. We'll get the confirmation of that next year if Apple discontinues the 5s. As for the iPad 3, if you've read this site regularly, you should know why the iPad 3 had a short shelf-life.
I'm on-site on a daily basis. I could understand the lightning cable switch but still, why not keep the 3 with its retina display over the 2?