Your original IP can still be uncovered.
Many rent-a-DDoS packages will include a Cloudflare resolver feature and there are online resolver tools.
As with any proxy, the attacker can also trace it back via FTP and MX subdomains (which are not handled by CF proxy)
Now saying that, it may still be a good idea to hide your IP through Cloudfare, if you are experiencing issues, but don't think one you do, you will be 100% safe.
Quote:
Originally Posted by Ua|Eight
currently, running a traceroute is only showing cloudflare's IPs
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Well that's a good thing.