That seems... Strange. How much is there in the magic department, lore-wise which wasn't tackled in Street Grimoire? I'm okay with some more magic crunch, but surely that wouldn't be the main part of the book, no? Hundreds of pages of just the above would be a missed opportunity, without a great story/plot hooks/setting material, IMO. I expected the latter from the whole Tarot thing so far.
And while I like the magic part of the setting, that would actually justify the cries of magic powercreep. Or should we prepare for an advanced book for every archetype? I wouldn't be happy with that, because it'd mean just more crunch instead of setting material (of any kind) and I don't like reading hundreds of pages of dry crunch.