Slated changes:
#1 sounds great. #2 doesn't really matter; the Library isn't really concerned about whether it's natural or not (unlike the Foundation, where this question is paramount). #3: Good idea to not involve cat deities, but if you wanna use Egypt, make it original. #4: Sure Why Not, as long as they're interesting. As for Rating, that does seem like a Foundation/GoC thing, so I won't be sad to see it go.
Possible changes:
#1 won't make any difference to the article, good or bad. #2 also won't make any difference except that the Hawaiian lavaskipper sounds entertaining based on the name alone. #3 sounds pointless. Why bother adding that? Also, I'm pretty sure you mean 'sapience', not 'sentience', since most vertebrate and a quite a few nonvertebrate animals are sentient. (Sentience, even though the term is often used incorrectly in sci-fi, means the ability to feel, perceive or be conscious, or to have subjective experiences.)
Let me used the superheating thing to explain something. When you think of a 'lava cat', them being 'hot' is an obvious thing that comes to mind. Because it's obvious, superheating ability is inherently uninteresting here. You can put it in, but don't make that the focus of the article. But if you added a detail like, say, Nigerian lava cats have a truly excessive love for rabbits to the point where they lure / chase rabbits into their dens and then bring them food and prevent them from escaping and basically treat them like pets/playthings (just to pull something out of my ass :P)… then that would be unexpected, and more interesting. I'm not saying use that specifically, just saying go for something unexpected.
