I’m catching up on some old-news. Had that small issue of a wedding over the weekend that otherwise occupied my time! And yes, it was successful! My bride planned a truly great event. 

But on to business. According to this thread on FlyerTalk.com, reciprocal upgrades are coming to Delta/Northwest in fairly short order. Good news! We’ll see how it works in practice. I’m sure there will be some kinks in the beginning, but I’ve found the reciprocal upgrade process between Continental and Northwest to work well.