I am going to assume that any Monster Hunter World 2 will be for next-gen (PS5, Xbox Series and PC) and won't be cross-gen with PS4/PS4 Pro/PS5, Xbox One/1X/Xbox Series.
Monster Hunter: World was announced at E3 2017 and released 7 months later in January 2018. The PC version was released 7 months later in August. All the while, we got new monsters added on consoles, but the PC version was well behind. We got a major expansion in Iceborne on consoles in September 2019, which didn't come to PC until January this year.
I am going to guess that Monster Hunter World 2 won't take quite as long to develop as MHW did, now that the MHW team is getting used to producing high quality HD monster assets for modern consoles. That said, I'm not expecting it will happen too soon. I wouldn't expect a release until January 2022 at the soonest.
Monster Hunter: World was announced at E3 2017 and released 7 months later in January 2018. The PC version was released 7 months later in August. All the while, we got new monsters added on consoles, but the PC version was well behind. We got a major expansion in Iceborne on consoles in September 2019, which didn't come to PC until January this year.
I am going to guess that Monster Hunter World 2 won't take quite as long to develop as MHW did, now that the MHW team is getting used to producing high quality HD monster assets for modern consoles. That said, I'm not expecting it will happen too soon. I wouldn't expect a release until January 2022 at the soonest.