First iteration, the "Ultra" probably won't be a 'Foldable screen" PC , but a decent chance that it will be incrementally heading that way if Apple believes that can make typing on the screen keyboard something that folks will grow into.
[ Kind of like the iPhone Air is 'half' of the foldable iPhone. Make the 'half' work and then go 'whole hog'. ]
It would/could morph into a very large iPad-like device when completely unfolded.
The old MacBook/Power 17" like chassis? Probably not. Times have changed. Type-C , one cable docking to a large desktop display means can just plug into a larger screen if just lugging laptop from worksite to worksite in many cases. There is also a 'second portable screen' market in the current era (for example
https://www.nytimes.com/wirecutter/reviews/best-portable-monitor
that is 4 examples but there are several dozen models. It is a growing market. ) . If have an iPad it also can.
Those are not going to cover everyone , but it does chip away at the folks who are left in the market. A 14" , 16" , and something bigger than 16"? Each one of those is an increasingly smaller group.
P.S. there are lots of dynamic alternatives being tried in general Windows market. ( it is a larger market so the niche pockets are bigger in unit terms. 2% of 90% is pretty close to being 2% of the overall market. 2% of 10% is extremely small.
Lenovo is teasing a whole bunch of forward-looking mobile devices at MWC 2026, but this twin-screen concept laptop—with lots of swappable parts—is the one that made me go "Whoa!"
www.pcmag.com