I ran across some of the documents that were filed in 2013 in the Klee v. Nissan class action lawsuit on this page:
http://classaction.kccllc.net/content.aspx?c=5619&sh=1
In the Declaration of Warren DeBardelaben
http://classaction.kccllc.net/Documents/NNK0001/EX 2 - JL Dec (Decl of BeBardelaban) Conformed.pdf
he talks about the new, expanded warranty that came out in May, 2013. He references documents sent to dealers explaining the warranty on May 29 and May 30, 2013. He signed the declaration on June 12, 2013.
The Parts and Service Bulletin Amendment No. NPSB13/006a (Exhibit 1 to his declaration and page 5 of the pdf) is the document I would take with me to the dealer if I was trying to get a battery replacement and was told I didn't qualify because I opted out. That document says nothing of the class action settlement and has faqs for the dealers that indicate that the new expanded warranty that applied to new 2013 cars now applies to 2011 and 2012 models distributed in North America.
The document says the first step for a dealer in replacing a battery is to confirm coverage under "SERVICE COMM" and to look for any open service campaigns, and complete any open ones.
Apparently the SERVICE COMM screen will look something like:
EV LI-ON BATTERY CAPACITY WARRANTY XX/XX/XX 60,000 Miles