Ruckus Wireless (RKUS +16.7%) soared over the course of the day after Motorola Mobility (NASDAQ:GOOG) disclosed a 4M-share (5.4%) stake in the service provider Wi-Fi hardware maker. Does Google, a major backer of public Wi-Fi networks, have a partnership in mind? (13G) Update: The disclosure is for an investment made by Motorola prior to Ruckus' IPO.