It's not much of a surprise, but it's still great news for the fans. Westworld has been renewed for a season 4.

on average, around 9 million viewers follow.
Atlantic the sci-fi series since the start of Season 3 airing on HBO.

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The date of season 4 of Westworld is therefore not known for the moment.
However,
Season 3 launched almost two years after Season 2, which itself was over a year and a half behind the first season.
It therefore seems quite likely that fans will have to wait for the same amount of time, at least 1.5 years, before they can follow the new adventures of Dolores and Maeve in this season 4

for those of you who haven't yet heared of the famous HBO serie

WestWORLD

here's a glimplse :

Westworld is an American science fiction television series created by Jonathan Nolan and Lisa Joy for HBO. it is an adaptation of Mondwest (Westworld in VO), a science fiction film written and directed by Michael Crichton in 1973. The series has been broadcast since October 2 on HBO in the United States, and since October 3 2016 on OCS City in France, on Be 1 in Belgium and on RTS Un in Switzerland.

The series takes place at a fictional amusement park called Westworld. This amusement park, which recreates the American West, is populated by androids nicknamed "hosts", who welcome affluent visitors nicknamed "newcomers". They can do whatever they want without fear of anything from the hosts. But after the android program has been updated, several bugs arise.

official trailer