CYD20
After seeing this particular topic (cyberpunk d20) brought up numerous times in numerous forums, I'm still suprised that not many people have actually heard of CYD20, which was I believe the first true cyberpunk d20 game to come out. It's now in its 3rd edition, using d20 modern mechanics, although I still have the other two editions available for those interested in using PHB-based rules. I still believe that it's the best cyberpunk d20 game out there, especially the 3rd edition, and all someone needs to run a cyberpunk campaign, and that's not because I wrote it.
I too am waiting for d20 future, but not to run a cyberpunk game. D20 future will be devoted on the entire science fiction genre, of which cyberpunk is only a small part (and not as popular as other genres), so I imagine it won't get more than 30-50 pages out of the whole book. It's much like Alternity; you could use it to play most sci-fi genres you could think of, but when it came to cyberpunk the scarcity of info, cybernetics etc meant that you had to devise a lot of things yourself.
CYD20 3rd ed is 160 pages long, full-text, no setting (use whatever cyberpunk setting inspires you more), just... stuff...lots of stuff...and rules about computers, AI, bioware, cyberware, feats, guns and the like. Oh, and it's free - I just made it because I love cyberpunk but I couldn't play Shadowrun because of the overtly complex rules or Cyberpunk because no game store in my area carries it.