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?  

The bit that is actually very helpful is the vertical separation. Yes, it may mean that I am descending to avoid an aircraft that is announced to be 200 feet above me which is, in fact, 5 nm or more away, but I'd rather err on that side than the alternative. 

By not having the equivalent audio alerts to PAW in the SD version, it means that some of us who would much prefer to take advantage of SD's 'smarter' audio traffic alert algorithm might decide not to. If the former were included, I know that I for one would not hesitate to use the SD version and enjoy, as it were, the best of both worlds!