They do still give diamonds (I noticed some from one of mine a few days ago) and I haven't heard anything about them changing the drop rate. Though I don't hear as much as the community managers.
Like all elements of chance some of use are going to see a much lower drop rate, others a much higher one. But over long periods of time most of us should see roughly 1% drop rates. I remember a similar discussion popped up when the soccer event was on, for some people the 5% chance shot never worked and for others it felt like the odds were much better than 5%. Observing collections of the time span of a few weeks is probably the most reliable way to test if you are or are not seeing a 1% drop, even then not all people are going to see the same percentages.