Ah yes, Mister Slade from the 'QuakeLives' project... Oddly enough, none of us have heard a thing from him since.
Basically he was in very hot water for not releasing the source - and his attempts to circumvent the GPL by pretending the patches he was distributing were closed-source failed... after all, the bytes he was replacing with were still derived from compiling the original source code and simply binary diffing the changes.
I happened to be stuck in the middle of this particular incident, and some of Slades arguments were quite amusing. In one case, he attempted to put up a pre-download EULA, stating that "You may not download these binaries if you intend to request the source-code". Very laughable... John Carmack even was prepared to pay a lawyer on this one (http://finger.planetquake.com/plan.asp?userid=johnc&id=13992).
For anyone intrested (its a good laugh) here's a collection of e-mails, irc logs, etc related to someone trying to ignore the GPL - badly. (Warning, some zealots contained within).
http://www.kev.pulo.com.au/quake/qlfiles/
This has already been done and the author very quickly got into hot water. IIRC it was less that two years ago, about a GPL game and an individual who published a mod as a patch to the game binaries but refused to publish his source. I'm not sure how it ended. You can probably research it in your copious amounts of spare time, I think there was an article on it on Slashdot at the time.