The lawsuit was filed by a company called Paltalk Holdings, based out of Jericho, NY. Remember what I said about venue shopping? This was filed in Mashall, Texas, one of the hot spots for patent lawsuits, due to generally leaning towards the plaintiff in these things. In 2002, Paltalk bought two patents from a company called HearMe that share data among many computers so that they all have the same digital environment. Paltalk is claiming that online RPG devs are infringing the patent. In 2006, they went after M$ (I believe it was about the time Halo 3 was launching and all the bad press about the builds of the XBox360 were coming out). It went to trial in Marshall, Texas. Hey, deja vu. It started in March, but never finished, as M$ settled and hushed the whole thing up with an NDA. This emboldened Paltalk, and they are suing Turbine, Sony Corp (Everquest), Activision Blizzard (World Of Warcraft and, presumably, the upcoming Diablo 3), NCSoft of South Korea (Guild Wars, Lineage, and City Of Heroes), and Jagex Ltd from Britain (the freebie game Runescape).
I don't know if the patent is overbroad, but the vintage suggests it may be. A lot of companies lately are opting to get software patents overturned instead of being hustled (there are lots of online co-op games long before this patent, so I think a Prior Art challenge will end this nonsense quickly). I hope this is one lottery ticket that doesn't get cashed.