If you ask "which new species will evolve next", then my answer is that species is a human-made category system nature doesn't care about. Specifically in the

If you ask "which new species will evolve next", then my answer is that species is a human-made category system nature doesn't care about. Specifically in the area of bacteria, you can constantly observe evolution (e.g., pathogens becoming resistant to certain antibiotics). When to label the result of such an evolution process as "new species" is a very arbitrary decision.