Technically, it was not a class action law suit. Class action lawsuits are brought in federal court, construction defect litigation is (generally) a state court issue. CD litigation is often multiple plaintiffs with similar, though often not identical claims.

Often homeowners are promised something for nothing by attorneys, and sometimes get it. Sometimes (but certainly not always), the defects claimed are insignificant, and depending on when the house was first sold, may not even include any actual damage or even claims of damage. Additionally, homeowners are often not even aware of the actual claims made on their behalf, and short of an actual trial (or deposition), most evidence of defects developed by the plaintiff’s attorneys and consultants are priveleged, and the homeowner never sees it.

That said, you should probably request all correspondence between the seller and their attorneys and find out exactly what the significant claims were and have your own inspector investigate those claims. If the litigation reached deposition stage, and the homeowners were deposed, demand a copy of their deposition transcript. (Most CD litigation does not reach that stage.)