Minefields as a mechanic have flickered in and out of 40K as custom campaign rules since 5th Edition, but this is the first instance where it has been used as the official mechanic for a specific unit. Interesting concept, just wish it had been thought of in a superior edition (i.e. any edition before 7th).
I think the only instance in which it would work well as a mechanic in AoS is for a Kharadron unit, as they already have stuff like Skymines. However for less technologically advanced factions (which is pretty much all the others) it just wouldn't work, visually or lore-wise.