The $59.99 Sony WF-C510 earphones are the company's most affordable option and generally deliver good sound in a well-made design that's comfortable to wear for long listening sessions.
We love the Sony WF-C510, but would you really know that they're a totally different and newer product than the Sony WH-C520? As yet, we don't have any concrete information on a launch date ...
One last thing: want to know what's new in Sonyland? Well, the (unannounced) Sony WH-1000XM6 over-ears have been spotted in a January FCC filing, which means they're (almost certainly) on the way.