So reading news around the web and from what I've heard some time ago. Indeed this should be a more luxurious long wheelbase versions of Stelvio.
Many media houses, those who were at the event in Modena, are reporting that this car will be slightly smaller than Levante but much more sporty.
They are also reporting of a class leading habitability/interior space.
This leads me to conclusion that this is indeed a long wheelbase Stelvio.
Wheelbase should be around 10 cm (4") longer than on the Stelvio. With that it should be longer than 2.9 m (114").