@otakufan:
Just a guess, and do forgive me for jumping immediately into Yams4Nakama, but it's probably because Yamato is more likely to get an updated card later on than King is.
The fact that King isn't a bog-standard human has been clear from his introduction back in Act II (I think), so they've know they'd have to address it for quite some time, and that, in all likelihood, this would be the only card for them to do so on, so I'd expect them to have prepared that reveal in advance. Furthermore, any info regarding the Lunarians on King's card could be revealed in simple text, without the need for accompanying artwork beyond just panels of King himself.
By contrast, Yamato only revealed that he had a Devil Fruit at all during his brief skirmish with Sasaki & Co., which was much more recent, and we only got the full reveal a couple of chapters ago. Even if they knew the fruit's name and powerset in advance, as I'm sure they did, there wasn't any artwork for his hybrid form until the past couple of chapters - they wouldn't have been able to do much more than give the name, some relevant text, and maybe a concept sketch or two. So, if they had reason to think Yams might get a second card in the future (likely due to joining the Strawhats), they might have been inclined to save his DF until they had art to go along with it.
That does make sense. I don't know if this is similar, but Law's card does now acknowledge that he is a member of the D. clan, where as his first card from the Supernova pack didn't. Even though the databook was announced during Levely arc and I don't know how old the Dressrosa arc was by then.
On another note, Zoro's card still lists him as only possessing Armament and Observation Haki, even though on Luffy's new card there is an image of him attacking Kaido with a CH infused punch, which takes place after Zoro attacks him using his new Kyutoryu technique. I don't know if it's not listed on there because it's speculation on Kaido's part or because in the chapter Zoro uses it, his response to Kaido asking him if he can use was that "he didn't know what he was talking about."?