From Michael Russo at Russo’s Rants,
Wild isn’t confirming, but I heard from them a couple hours ago that there would be a smaller signing this afternoon. While the team doesn’t have a signed contract yet for Miettinen, this appears to be it.
Update 4:30pm ET: At the above link, Russo says this is now confirmed by the team.
Update 6:58pm ET: TSN states the contract is 3 years.