However, does anyone know what will happen with audio alerts of bearingless traffic? Will SD have them too? PAW's version is quite effective, giving three increasingly 'threatening' categories of alert and - crucially, given that there is no horizontal distance and direction information - calling out vertical distance/separation if less than 1000 feet, above or below. So when you hear that another a/c is 200 feet above, that can be a useful prompt to descend, even if you're not sure exactly where that other aircraft is. 

On the new SD voice alerts, what - if anything - will you hear if bearingless gets close?