What do you mean exactly when you say "old fantasy armies"? Some were sorted when they made the first GHB a few years back and have not gotten an update since then (does not automatically mean they are bad) while others have been rolled into or expanded upon to create entire factions. For example, the just witch elves from the dark elves were put into their own army "Daughters of Khaine" with a bunch of new kits. The ghoul part of vampire counts was made into their own faction by devising new builds from existing kits to make the Flesh Eater Courts. Night Goblins, Trolls, and Spider Riders were rolled into a big faction called Gloomspite Gits which is seperate from Orcs, while Beasts of Chaos exist as they were (just minus the models that were cut).
On to the specifics, foot-Ogres were put into Gutbusters while mounted-Ogres were put into Beastclaw Raiders. Ogres are not in a great place right now army-wise and it is widely felt they will get a combined battletome in the relatively near future; I would wait for that.
Empire has been split up into several sub-factions, but the main empire infantry were put into a faction called Freeguild. These guys have a section on the latest GHB and so are a current army in the sense that they have decent rules and are not going to be cut.
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