The Beta 3.9 update has so far confirmed to be bringing two new ships in to the game, the Faulcon DeLacy Python which is a heavy transport ship and the Saud Kruger Orca which is a specialised passenger liner.
The Elite: Dangerous Beta 3.9 update will bring the fixes, tweaks, improvements and optimizations that are now customary with each major update.
Reaching the rank of Elite, can now be achieved through trading, exploration and combat, rather than combat alone.
It is now possible to gain ranks with both the Federation and Empire by working on their behalf.
It is now possible to barter with other players in deep space, by transferring non-stolen goods to them.
More variety in what missions you are able to do. A significant overhaul of Unidentified Signal Sources, giving increased variety and adding more mission related context.
Ship outfitting has had a major overhaul.
Galaxy map has also been improved with a major overhaul.
Open-mic voice communications between up to 6 players in a group has been added.