We are looking for a "Combat Designer", which in itself does not necessarily have to have something to do with Ghost of Tsushima (buy now € 62.65). However, the following text makes a very direct connection. It says that the new employee he is looking for should "have played Ghost of Tsushima and understand its basic combat system". He should also be able to work on enemy balancing, player skills, and a progression system. All these features were also available in Ghost of Tsushima and at least suggest that a successor is in development.
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However, you should Enjoy the whole thing with a certain degree of caution for the time being, as an opinion or even confirmation from Sucker Punch is pending. So it's not much more than speculation at the moment. However, it would not be entirely surprising if the team actually worked on a successor. After all, Ghost of Tsushima has sold more than five million times within six months of its launch. So there should be a financial interest in another game. We will keep you posted in this regard.
Source: Job posting from Sucker Punch