This changes everything! I had it in my head that the Battalion was just the old Standard Force Organisation Chart with an extra HQ slot.
Well, this makes army selection a little easier, doesn't it? My only real complaint about eighth edition was the sudden proliferation of buff characters competing for my Elites slots. The Noxious Blightbringer springs to mine or all those mini-characters who used to be mere components of the Space Marine Command Squad who are now independent characters in their own right.
Honestly, I am really glad this is a thing. One of the best things eighth edition Fantasy did was increase the Special Choice limit to 50% of your army. Generally speaking most of the big theme units are in the Special choices. Usually this means units that are from somewhere like Swordmasters of Hoeth or units that represent a specific sub-faction like Plague Monks.
This is less the case with 40k but Elite choices tend to be where the specialists live whilst your Troops choices tend towards generalism (unless the army itself tends towards a specialism). For one thing I imagine Eldar players are happy for the chance to take a wider selection of Aspect Warriors. For my part there are so many cool Elites choices available to my Death Guard and Black Templars that I'm glad I no longer have to skimp on the cool stuff.
Hey, everyone likes more cake.