"In rescheduling these matches, the health and safety of players, associated staff and supporters has been at the forefront of our thinking", organizers said in a statement on Wednesday.
Six Nations chiefs revealed their delight in being able to complete this year's tournament, while also confirming the eight-team autumn series.
According to reports, 2019 Rugby World Cup hosts Japan as well as Fiji are set to join the Six Nations in two pools of four sides before a play-off round in December.
Wales could be required to play this home fixture at an alternative venue, possibly in London, as the WRU are unsure if the Principlaity Stadium will be available for use.
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Ben Morel, CEO Six Nations commented, "We are absolutely thrilled to make this announcement today".
Because of the travel restrictions now in place preventing many teams to travel to Europe, organizers also confirmed their plans for an eight-team tournament in place of the men's Autumn tests that will involve the Six Nations teams and two other worldwide teams, likely Japan and Fiji.
"We remain in close contact with all relevant authorities across the respective jurisdictions to ensure these matches take place in a safe environment and we will announce further details of health-and-safety protocols and guidance on spectator attendance in due course".
'There is still so much to play for, and we are hugely excited for what lies ahead.
'Public health remains the number one priority and while we must continue to be vigilant and cognisant of the dynamic and fast changing external environment, we are nonetheless extremely pleased to be moving in the right direction'.
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'We are now finalising match schedules, operational details including venues as well as commercial arrangements. "Further announcements relating to this competition are expected to be made later this month", organizers said.
'This tournament will be a unique eight-team competition, involving the Six Nations unions and two other global teams.
It's been decided that the three outstanding fixtures in the Under-20 Six Nations can not be played and there will be no victor of this year's Championship.
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