It was definitely published, as I have it behind me. ( along with the other two. )
Looking at the publication date I suspect too it's the last SM2 product.
Now, as the picture on Brent's site is the scan of my book ( you can see on the top some glitches caused by the crystal covers I put on most of my ICE books to protect them. ) you may think that we are making it up. We are not, I know at least 4 people that have (had ) it in France.
It contains several new professions ( I like the Combat Engineer ), two new psion lists [ Mass Mastery and Psion Discipline ]. An alternative Psion system called Psifire, some skill stuff, some cyber stuff ( so that you can actually have Cyberspace meet Spacemaster without unbalancing too much the game ), new toys to kill others and various equipment, biotech stuff ( some of them makes me think the Drakh from B5 read the book
), Rules for nuke ( Yes, that's where the rules for Radiations are hidden ) and so on.
Oh, and with that I had to remove the crust of dust over said companion in my library.