I dunno, if you poke your head out from the Craftworlds and Eldar writ large, the only things that move in a peculiar manner for their type are...
hold on...
ummm....
Ah! Those chicken walkers the Skitarii have.
So, you've got Infantry/Monsters/Artillery, Bikes/Jetbikes, Beasts/Cavalry, Jump Packs, Jetpacks, Vehicles, Flyers, Superheavy Vehicles, Superheavy Walkers, Flying MCs, and Gargantuans.
Granted that's a lot of categories. Also granted there are a few special rules that get involved (who has Move Through Cover, who has to make dangerous terrain tests and when), but I really find this less complicated than every single damned unit having a unique statistic.
That is *unless* the point is to give everybody pretty much the same statistics (M4 for Infantry, M5 for Fast Infantry, M8 for Bikes/Cavalry), but then you're doing the exact same damned thing as we already do anyway.
And I kinda doubt GW is going to remove all those special rules (again, most of which apply to Eldar and their cousins with relatively rare exceptions), since it seems their stated purpose for adding in a Move stat is to "make units more distinct." That means more complication, not less. Another thing to memorize for no particularly good reason or, perhaps, the exact *same* thing to memorize as before, just not listed in any central area.
The Move statistic was dumb. I'm glad it is gone. It was the best change from 2nd to 3rd Ed, it streamlined the game, and made learning to play and playing easier. You want to ice all those special movement rules? Be my guest. But the re-inclusion of the Move characteristic is not (not not not) a move to simply the game. They are planning to do this opposite there, or I will eat my hat.