According to Chris Peters, Sweden have removed Jonathan Lekkerimäki, Noah Östlund and Liam Öhgren from their showcase roster in favour of Zeb Forsfjäll, Felix Unger Sorum (both of whom were drafted in later rounds at this year's draft), and an undrafted player in Hannes Hellberg.
There's no clear-cut reason for now why Lekkerimäki, Östlund and Öhgren prospects for the Vancouver Canucks, Buffalo Sabres and Minnesota Wild respectively have been removed from the team. Perhaps this is out of a desire on Sweden's part to scout players who are younger and less likely to make the team, since Lekkerimäki, Östlund and Öhgren each look like sure bets to be on their final squad at the actual tournament in December.