Our notorious scribe, nyarlazorbec, grand master of the deck builder, will have some questions to answer when adding core to our electronic tome of dynamic cross referencing. As comparison, the Arkham and Eldrich Premium reedited and duplicated cards are filtered well. For most of core, this approach will apply. Mostly, a new image pack is not necessary. But for those few core cards that I have repeatedly been highlighting, the answer is not as obvious.
Deckbuilder is perfectly usable when a base set image pops up when looking at the premium counterpart (and visa versa). Similarly, the click box for Errattum/Clarification/Information is sufficient versus adding images of the new fixed text boxes.
The core set cards that won't conform are Triggerman, Torch the Joint, Steve Clarney, Anthropology Advisor, Visiting Author, and Forest Sister. I echo Marius' sentiment about the confusion in considering these six cards.
The answer lies I think in the "reedited / duplicated" filter. But it's not cut and dry like On the Lam and Court of Yhtill, and the other premium-only cards. Or maybe it is. Those six cards are just different.