Jessica's brand new C1 Grendel sprites are now available to download! These updated sprites fix a lot of issues present in the original, and I recommend them, even if you don't breed Grendels. Get the updated C1 Grendel sprites here, at Discover Albia.
Fishing Cactus have also mentioned they will announce the release date for Creatures 4 soon. Keep your eyes peeled!
Image courtesy of Creatures Wiki.