is release 0.11 out, see updated docs but no binary

In the works, almost there.

is the new query engine enabled in this release , I see the timeseries fill example uses nested sub queries

Gapfill is available in existing engine. Which nested subqueries example are you referring to?

example on here https://docs.pinot.apache.org/users/user-guide-query/gap-fill-functions 3 levels of query

Yes, this query is supported. However, this still uses the existing engine and works only in context of gap-fill. I’ll see if we can clarify that in the docs.