I will admit I had never heard about this service till I saw this announcement.
Seems like a cloud-hosted SaaS (or AI/ML as a service?) solution that let you build deep learning AI/ML models written in Jupyter notebooks that ran on their cloud infrastructure?
I'm not sure how this differentiates from, or competes against, very similar AI/ML offerings from the larger public cloud providers (Azure Machine Learning comes to mind, though I'm sure AWS and GCE have something similar.)