Lots of questions.
1. Does this mean Jeff Sessions signed off on the statement? What are his motivations for doing so?
2. How much of this was influenced by Comey's (highly questionable IMO) decision to announce they were re-opening the investigation into Clinton's e-mails just before the election?
3. How seriously should we take this? Is it simply a palliative measure (see question 1)?
4. Will announcing the investigation be an impetus for POTUS & Friends to start destroying evidence? After all, they've been using their own non-governmental servers and what-not (and those are just the ones we know about).
The first three are mostly unknowable, for now. Trying to do useful research in this arena has become fairly daunting, the signal to noise ratio is lower than ever. I gave up, I had other research to do.
4. They probably only started destroying evidence right around the time Trump (or someone he takes advice from, if such a person exists) gauged that not everyone in the world was writing off his early campaign days as an utter failure. Trump's problem is that it takes more than a year or two's worth of furious evidence erasure to whitewash a billionaire-level family empire's paper trail. He's in some shit, dude, even though he's bought leagues of people to assist with the effort, I'm sure. We'll probably hear from them after the gag orders get lifted. Yeah, they'll start by looking into Russia, but god knows what else they'll find.