DD, RP touched on part of it so I shall expand. Time late at datum, drawing at the wrong end of a field a high speed dash at 400k came in very handy. Covert radar search, did it still exist, revisit times meant you needed to balance a search speed against endurance.
Will there be separate single mission type UAV? The high altitude one for sowing and monitoring a field with perhaps an additional surface surveillance capability; one for low level weapons delivery and a low altitude surveillance capability?
Maybe a return to an Ikara type system where the torpedo can be rocket launched from altitude - a second Ford Transit van?