the first A330-800 (the NEO equivalent to the A330-200) was delivered to Kuwait Airways a few days ago and thus has entered commercial service.
Will it be introduced into the game shortly?
If all goes well, it should be part of the next data patch (expected for early December).
Any idea if on the upcoming patch will be also the A321PF?
There are no conversions in Airlinesim and 321PF is s conversion aircraft. Conversions, though, were promised two years ago at the end of 2018 along with the credits cost increase, were meant for 2019 and AFAIK have not materialized yet even though we are almost in 2021.
What is the B737-300F then? AFAIK the Bobby was never built as a cargo aircraft out of the factory.