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?  

Why is that, Tim? Is it something to do with the whole GDL90 thing and/or UAT weather integration?

Obviously bearingless targets is a great facility (especially if PAW continue to develop innovative capabilities such as their MLAT) and it does seem a shame that verbal audio can't be used (if it's technically possible). I think it's going to be a LONG time before we see every aircraft carrying ADS-B and until that time the likes of bearingless targets help traffic awareness.

If not the actual bearingless target information, will there still be a "traffic" warning to give the heads-up that something has appeared on the screen?