Seamless interaction between phone and Windows is their mobile strategy. Windows 10 already did a lot in this direction, with the ability to link a phone, or to cast the phone screen onto a dedicated window. Allowing apps to run in Windows is a logical next step.
The other part of their mobile strategy are tablets or tablet-substitutes. Basically their whole Surface lineup, which Windows 11 aims to improve.
Except for one small detail, they appear not to support the latest Surface Go 2 tablet! According to the PC Health Check tool, my maxed out Microsoft Surface Go 2 that I bought new a few months ago (with 8GB RAM, 64-bit Intel core m3 processor) is NOT supported to upgrade to Windows 11. Wow. Their system requirements tool also doesn't say why my tablet doesn't meet the requirements, just that it doesn't.
The other part of their mobile strategy are tablets or tablet-substitutes. Basically their whole Surface lineup, which Windows 11 aims to improve.