I wouldn't count on the other models. At least not yet: Ineos will have to manage a zillion things before launch and have a lot on their minds. Besides this they will first want to see how the Grenadier is adopted. Further decisions will likely be based on this feedback.
Nobody knows whether or not the Grendier will succeed or flop. Though I consider it an excellent car, they will be smart enough not to overdo things.
To make a long story short: It will take quite some time before they decide, develop, announce, test and finally deliver any new type. At least one, two, three years, I guess - not considered corona and war effects with all their supply chain uncertainties ...