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There was an interview with Kazuto Yamaki about 3 months ago (I'm not going to link to the tracker-ridden rumours websites that carried the story) where he said Sigma were working on a "different" 70-200 f/2.8 that would be available "sooner rather than later".
Yes, I saw the interview, that was early March this year, but he first talked of the lens in Feb 2020 so not holding my breath. Saw elsewhere that the latest Sony 70-200 2.8 was a Sigma design (whether that is true or not who knows), but that supposedly is the reason for the delay. There is definitely room and need for an alternative to the too large and too hefty Panasonic 2.8.. and given Canon's RF 70-200's (which are more compact, lighter weight and great performers) have been out there a while now, I hope Sigma have looked at them and put their design team to work, and I would like some more idea of when to expect.
I think Panasonic dropped the price of their 70-200 f2.8 quite a lot.
It is likely still much more expensive then an upcoming 70-200 f2.8 Sigma, but offers a lot of performance and features. It's a little bit a pitty that Sigma was not able to use the time to release their lens as long as Panasonic still wanted to have the full price ;-)