Here's an example:
When you click the word "Pronunciation" in front of the icons, you are taken to an explanatory section. In there it says:
The pronunciations given are those in use among educated urban speakers of standard English in Britain and the United States. While avoiding strongly regionally or socially marked forms, they are intended to include the most common variants for each word. The keywords given in this key are to be understood as pronounced in such speech.I'm curious to hear one of these "further pronunciations", but haven't found one yet.
Where a word is associated with a particular part of the English-speaking world, further pronunciations in the appropriate global variety of English are also given.
What's also new is the frequency band. When you click the series of eight increasingly larger bullet points, you're taken to another explanatory section (http://public.oed.com/how-to-use-the-oed/key-to-frequency/), where the calculations of relative frequencies of words are explained.
Postscriptum: I've just come across Jack Windsor Lewis's latest blog, in which he hails the new features of the OED. So he holds the ius primae mentionis.