He made the comments via a blog post moments ago:
If you are currently on iOS 7, I would recommend downgrading to 6.1.3/6.1.4 (via DFU). Why? There is currently a possibility of a potential 6.1.3/6.1.4 untethered A5+ jailbreak being pushed in the upcoming days/weeks.
If you wish to be included if such thing takes place, downgrade now. While you still can! Once iOS 7 goes live later today, the 6.1.3/6.1.4 signing window should close within the hour of the release (possibly even minutes). If you're still running 6.1.3/6.1.4, today is your last chance to restore and get a "fresh" start.
The jailbreak would likely be based on the work done by winocm. To keep up to date with progress on the jailbreak's release, please follow iClarified on Twitter, Facebook, Google+, or RSS.
We'd also suggest saving your SHSH blobs if you haven't already.