It should be the next 6-8 months, depending on how fast we can follow up the current workflow. There are major changes coming soon, so it may take some time.
Well, it is not how it work exactly. The asp_query_args hook let’s you access the query arguments of the search – and change them as you like. In theory you could add a drop-down somewhere (say the ordering drop-down), then append the value somehow to the search form. Then somehow get the value from that argument within the hook and change the ordering accordingly.
However I don’t know if I can recommend doing this at all. It is extremely time consuming to get it right and may not work whatsoever.