Haven't seen much about this project nor if it will be open-source. But it looks at least promising and I really loved Apollo in the past.
I think any good alternative client that can use the current momentum of kbin/lemmy is good.
Even more since Jerboa is afaik developed by one of the two main devs of lemmy and they will probably/hopefully focus more on the core development and I doubt that they can maintain an additional mobile app at the same time.