The latest round of FW new releases has the forces of the Death Guard coming to Vraks. These upgrade kits are hopefully first in a line of upgrade kits covering many of the first founding legions.
I really like these new Plague Marines. They are really similar to the old 2nd ed. guys, which have a great look. Its a shame GW put out the Plague Marines they did as the main kit, instead of revisiting these old classics.