I'm a big fan of the new Mammut protection bags, especially since I live in a place where trauma is a big part of the risk, not just burial and suffocation. Having the bag inflate around your head like a collar instead of behind the head or on either side of the pack seems like a big advantage, so thats probably what I'm gonna get this season.
Being able to swap the air bag system between different pack sizes is a great feature too, Mammut and ABS are the two that come to mind but there may be others. Having the ability to use a smaller pack for side-country missions and then swapping to a higher volume pack for full or even multi-day tours is another thing to consider.