I really like that it switches off the outer pair of propellers in level flight, that's a nice feature.
Changing the vertical alignment of the wings to horizontal after takeoff is also really cool, an interesting alternative to 4 vertical propellers with a separate pair of wings. It seems to eliminate the extra moving parts to control those vertical propellers.
The wing folding mechanism is pretty novel as far as I'm aware. The idea of quad hover to forward flight isn't new or unique but the specific configuration is something I haven't seen before. NASA was working on some that tilted the whole wing not this folding design which uses fewer motors compare to the old NASA Greased Lightning test article.
Osprey has a common power shaft between the engines for fault tolerance, constraining the structure's design, such as the lack of dihedral. This has a different set of design constraints and a different solution to propulsion failure.
