There is a connect add-on that's been released recently: https://marketplace.atlassian.com/plugins/nl.avisi.jira.plugins.relations-for-jira
It's not the same as CRM for JIRA, but also covers CRM functionality.
At the last AtlasCamp, there was a very strong implication that no more "type 2" addons are going on the approved list for Cloud. As for the suggestion about Atlassian writing a CRM addon - your guess is as good as mine. If they are, then I'd expect it to be something they bring up at Summit in November.
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