Yes, there are still experimental questions. https://www.mba.com/the-gmat/test-struct ... iming.aspx
Under heading 'Are all questions counted?'
As to how many/how often/whether it's possible to identify them is open to speculation, many people have different theories. But still, just theories. The official GMAT statement is what's in the link.
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Redeemexperimental questions....
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