Although I suspect they will have several pure electric vehicles, The tiny amount of info I have been able to find indicates they will also have at least several hybrid models. I personally believe that the timing of this is related to the production schedule of Solid State Batteries (SSB's) in the near future. Regardless of what the first versions of Volvo EVs and hybrids use, it won't be long before SSB Volvo's are in the line-up.
My son has a Chevy Volt, and about once a month he purposefully leaves his battery at half-charge and selects the powertrain management mode where the engine kicks on when they drive around on their day off. This ensures the engine turns on and runs a minimum amount of time that he desires. They have two cars in his family, so he was a good candidate to drive a pure electric EV (24 miles round-trip to work, only charging at home).
But...he found a really good deal on a used Volt, and he liked the idea of having enough range to go anywhere (since it has an on-board engine). My point is...argue all you want about whether pure EV or hybrid is the way to go...once a customers' cash is on the line? Many buyers opt for a hybrid.
If you only produce pure electric EV's, you're saying to people who want a hybrid "I don't want your money, go spend it somewhere else". When I look admiringly at everything that Tesla has done (Roadster, Model S, Model 3, Powerwall, Model X...) They made the right decisions, but...I actually want to see what a Tesla hybrid drivetrain would look like. I hope they remain successful, and I hope they make a hybrid someday.