Detail View feature of Big Picture should be available on JIRA cloud as well. This feature will help in simultaneous modifications in the Jira. Otherwise we have to go Jira and edit the fields in Jira or Big Picture should all editing on Time Tracking fields on Big Picture itself.
I think that is a really important feature to benefit from the BP advantages also in cloud. Many of my server BP customers use this feature extensively. Hope Atlassian is providing the API for this.