The Elektron Digitakt is here, and the Octatrack has a MKII version coming soon. If you are thinking of making a purchase and need a bit of insight, this video from Cuckoo may help you make your mind up.
Cuckoo had this to say, "They are overlapping in what they can do, but I think they are different enough to justify that Elektron keeps selling both of them. So here's a mega workflow comparison video where I'm comparing them side by side in a number of aspects. It's a bit long, but if you're interested in this stuff, I hope you'll find the video interesting."