Tanya's said it's really unlikely. The cats she'd based the cats on died, and while she could deal with the death of the older cat in terms of it being his time, the death of the younger one hit her really hard and made the books just not fun to write anymore.

I know, I was sad, too.

Though if you haven't read Enchantment Emporium by her yet, do. It's a very similar sort of feel, though obviously a different series/world.