Sonos Playbase and Boost tipped incoming

A pair of unannounced Sonos products have been heralded with trademark filings, the Sonos Boost and Playbase, though exactly what they might be is still unclear. Sonos' wireless music streaming system has for many been the go-to option for multi-zone entertainment, though in recent months has been under attack from rivals like LG's Music Flow. Now, it seems, Sonos is …