Sony’s WH-1000XM3 wireless noise-canceling headphones are a bestseller, but they’re due for an update. Now, we have some clues about what to expect from the next version of the headphones. A filing with the Brazilian telecommunications agency, Anatel, appears to show photos of the new XM4 headphones — which look extremely similar, if not identical, to the previous version, as well as giving some information about what new features could be expected in the highly anticipated XM4s.

The filing was identified by Everton Favretto, a Brazilian tech enthusiast who first tweeted the information that Anatel had approved the headphones:
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