Mosaid already has experience with IT lawsuits against Dell, HTC, Sony Ericsson, RIM, Huawei, Wistron, ASUS, Lexmark, Canon and Intel, among others. Nokia has likely chosen it precisely on account of those valuable skills, and probably encouraged by its own win against Apple, which resulted in more than half a billion dollars settlement, plus ongoing royalties from each iPhone Cupertino makes.
If anyone has the moral right to sue for wireless patent infringement it must be Nokia and Motorola, which basically created the mobile industry. Granted, they slacked and became bloated and complacent, but Apple's disruption has certainly been a wake-up call. They will probably never become what they were again, but some patent-related income should go a long way while they are restructuring and preparing for existence in a different world of mobile.