How should I handle this situation? I mean it's great news for me, the promotion is away from my technical engineering role and into a more general management job, I'll now have direct reports - which is exactly what I want from my MBA.
However, my "current supervisor" is now out of date, which throws a curveball for my recommendations and all my essays that are 90% complete would now be talking about my previous job.
Any advice is welcome, thanks.
First off, congrats!
Your new supervisor won't have the time (and possibly the knowledge) to write you a good recommendation. Don't worry about this aspect.
I would say just be sure to update your resume to include the recent promotion and maybe even call it out in the optional section. You an explain that the promotion has moved you more toward the role you're looking for (and explain why this is what you want!) and that you decided to keep with your current recommender because s/he knows you best. You might instead modify the "Why MBA" essay to include the recent promotion and how it furthers your goals. Let's be honest, your previous job is for all intents and purposes your current job. They won't ding you on a technicality.
Blogging about the MBA application process. Because I need to do something with all this bschool energy.
http://www.mybreakaway.com/ Recent post: September 20, "Transitions"
Yale School of Management MBA Candidate, 2015.