According to the GW v Chapterhouse docket, the complaint has been served and filed, so the lawsuit is going forward.
An initial hearing is scheduled for the 28th of February, but so far Chapterhouse hasn't answered the complaint. Technically, the time limit for Chapterhouse to answer the complaint ends on the 10th, but a 60 day informal extension is typical in these cases. Any agreement like this wouldn't show up on the docket since it's not a formal motion.
A more in depth look at the paperwork shows that the plaintiff (represented by Foley and Lardner) filed notice of the summons on January 11th. It was served in person a few days later and then sent back up to Chicago. The process was completed on the 28th. Given that Foley and Lardner's initial letter to Chapterhouse indicated that Chapterhouse had until the 10th to respond, it's reasonable to conclude that serving the complaint on the 11th was the plaintiff's predetermined schedule. If you also consider that the attorneys were unavailable until the 6th of January, it's pretty clear that Games-Workshop fully intended to serve the complaint and had little interest in resolving the issue without doing so.
We now have to wait and see how Chapterhouse answers the complaint.