I bought the two books what were translated to Spanish, and I also d20 Menace, d20 Cyberscape and d20 Past. I couldn't bought d20 Future. I was interested in d20 Spectaculars, about superheroes, and even I saw the cover.
My opinion about d20 and modern technology is the power balance may be broken easily. I can explain it with a couple of examples. In Sylvester Stallone's "Cobra" the girl, played by Bridggite Nielsen, had to hide and run away like in a survival horror because she couldn't face the night slasher, the main antagonist, but in the end of the movie the main character with enough weapons and ammo could kill all the cult of the new dawn, like a one-man-army shooter videogame. In the first movie "Alien: the Eight Passenger" only one xenomorph was enough to kill almost all Nostromo crew, but in the sequel with the remote-control sentinel tower machine-guns they could kill dozens, maybe hundreds, from other room.
We need a right way to know the true value of the Challenging Rating or XPs when an nPC can use technology. Let's imagine the first encounter is a wild mutant (using the stats of a level 1 goblin) with only a spear. Easy to be killed. The next time other mutant with the same stats, but a sniper from the top of a tree. This time the XPs reward should be like surviving a trap. The next time is a mutant using a exosuit, like the ones from the videogame "Call of Duty: Advanced Warframe". Harder, of course. Later, the boss is the mutant but wearing a powered armour like the ones from Fallout videogames. And the final boss is the mutant with the same stats, but piloting a mecha like the B.R.U.T.E from Fornite: Battle Royal or the videogames Titanfall.
WotC has got plans about a new d20 Modern, or a sourcebook about modern technology for D&D. Why? To sell, for example a Fortnite: Save the World d20, or a Overwatch d20, and maybe some day a d20 superheroes.
A d20 modern is possible, but totally compatible with the classic D&D isn't so easy. You can create a d20 Mortal Kombat, but these can't fight against the monsters from d20 Doom Eternal. You can create a d20 Street Fighters but theses can't face d20 Resident Evil.
A d20 with the ultimate rules for superheroes would be a true gold mine, a hook for new fandom but this needs a lot of time, and conflict about gameplay vs coherence, like the videogames where Batgirl can defeat Supergirl or Gwenpool win in a fight against Hulk or Thor.
