What is around the corner and/or is a role that needs to be filled?
-Krait looks to be a lightly armed, but (purely based on aesthetic) agile SLF carrying combat ship. Like a light Vulture with a fighter.
-Chieftain looks like an Alliance dropship. I'd expect similar capability, but in a less drifty ship that has less armour.
-Panther, if it is still coming, will represent absolute largest cargo capacity. I'd expect equal length/height to a Beluga, and Type 9 (10) width of actual hull (not including wings) Easily highest mass.
-Type 10, well armed carrier ship?
As for roles yet to be filled, Imperials still need a medium pad landing ship. I'd personally like a design with old-school retractible wings. They also could use a smaller SLF ship to the Cutter. Either add this capability to their medium, or a variant clipper maybe.
Alliance will be a collection of unknowns, but will probably include at least 1 dedicated fighter, smaller than the Chieftain, and 1 big ship of type 9 size or larger. In these categories, they just fill the "Alliance version of..." role.
Krait offers a potentially decent platform for SLF multicrew use without rank requirement. Expect to see the Keelback take a backseat, but I'd like to see a Keelback mk2 based on an Asp.
Personally I think the remaining roles that need filling would be best served by redefining the landing capabilities of existing ships. Allow Type 6 to use small landing pads. It'd fit, but is 1 meter too tall, apparently. The same is true of T7 on Medium landing pads. It is only logical that these cargo boxes would be designed to maximise pad space usage, rather than near-minimise. A little less likely, but let Orca land on medium pads, or introduce a variant model that can.