I'm not really sure what you mean by this. I don't recall TSR publishing a campaign setting book using documentation they already had in house.
It was more along the lines of putting something out 'on the cheap', including recycling a lot of art assets -- TSR was infamous for that in the '90s, to the point where just that issue is one of the big reasons their own entry into the CCG market, Spellfire, tanked so badly.
As I noted above, WotC doesn't buy all rights to the art they put on their cards, so if you see reprinted card art, it'll likely be specific pieces that WotC's folks went back to the artist to arrange a different rights assignment, which is good -- it means they'll have to be picky about the art they recycle, and that it won't be that much less economical for them to just commission new art for the book. I can't really speak to the mechanics and other 'crunch' until we see the book, but it seems more likely that, if the book takes shortcuts, that's where it'll be.
Not to mention that there are a few other reasons to see a Ravnica book:
- The concept has a champion in James Wyatt that it never really had before -- previously, there were D&D folks who were curious about the potential (I know because I've spoken with them), but didn't have the time/resources/what-have-you to pursue the concept for previous editions. (One nice thing about 5E is that mechanical design is downplayed, so is simpler to execute. A 3.5-era Ravnica setting would necessarily be far more crunchy and thus more time-consuming to design and execute.)
- Magic's 25th anniversary: not a bad thing to remind old Magic players that the game they used to love (and play while waiting for their D&D games to start) is still around.
There's a confluence of factors coming together on this: the 'we can use our setting bible as a resource' is likely a big factor, but that's always been true, and we haven't seen a D&D product like this before.
CapnZapp said:
Could still be feats too of course (like how Eberron dragonmarks are effectively nothing but more feats).
The idea I'm seeing is that dragonmarks in the new Eberron book (as opposed to the
original first-pass Eberron conversion guide released via Unearthed Arcana) effectively replace your character's subclass with a subclass defined by the mark -- which is a really interesting idea, but also one that leads itself way more to optimization than simple feats do. ("Why are you a rogue with the Storm mark? That's just a waste.")
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Pauper