Hey all, we are actively working on getting a first batch of community nodes to n8n cloud right now and should have something before end of April.
We talked very briefly about it during the February livestream, those are always a good source to hear about upcoming features. 
For now, we’ll vet and verify all of these nodes for functionality and security and just allow nodes that have no external dependencies (should be fine for most integration-type nodes).
In Q2, our plan is to explore something similar in spirit to what @Chrevor suggests — node sandboxing — to be able to vet faster and lift the dependencies constraint. But when that will see production is still TBD.
Docs on how to submit a node for verification are pending, I’ll update here once we’ve got something worth sharing. If you do already have a node that you’d want to see on Cloud, you can submit it via this form: Submit Your Community Node for Verification by n8n
—David