Looks like they come out in about a month same midsole as the 8 update with Lightstrike. New upper more in line with the Adios 5 and adizero Pro. Looks promising as the 8's upper was pretty bad.
I've heard the new Adios 5 leans more towards lightweight trainer so wonder how it will compare to the Boston 9 and might make the Adios redundant as they already weight more than the Boston 8's but with less cushion.
https://www.roadrunnersports.com/rrs/products/36090/mens-adidas-adizero-boston-marathon-9/?cc=100