Upvote:7
Converting comments into an answer:
First my own, although not the same country, I had similar experience when the Canadian immigration website showed "decision made" after a three year struggle to gain citizenship. What the decision is only came to light when the physical mail has arrived a few days later.
Second, pnuts points out since you can't do a thing, there's nothing to do but wait. Above anecdote corroborates.
GayotFow points out, arriving to the same conclusion: A visa decision is a deeply personal matter subject to both regulation and long established policy. It's utterly and completely private between them and the applicant and they observe strict formalities. Because of that they will never ever reveal the actual decision in a status update and you should be grateful for their discretion. Find something else to worry about.