Obviously that is the case, with the release of the Grav-Tank I'm expecting to see a fleshed out Custodes list in Inferno with more wargear, HQ choices (I expect the banner will be tied into an HQ and will be similar to the Legion Herald Consul in concept), the Grav-Tank, and probably the Grav-Rhino. I wouldn't be surprised to see they can also take Spartans as transports.
We also have artwork (that has been out a while not images of) for Legio Custode Tactical Dreadnought Armor, Contemptor Dreadnoughts and Jetbikes but I expect more options to come out later down the line such as the Siege of Terra.
Also given the lore on the Leviathan Pattern Dreadnought I wouldn't be surprised to see them included in the Custode's armory.