Earlier this week, we found that the FAQ for the Russian version of Lost Ark seemed to indicate that the game would not be region-locked when it launched. However, the FAQ has since been updated with a somewhat ambiguous statement that "the localizer reserves the right to impose regional restrictions on the basis of an agreement with the developer". Mail.ru further said that it has the right to publish Lost Ark to Russian-speaking nations in the CiS region.
At the moment, there are no restrictions on purchasing a Founder's Pack or to sign up for beta testing opportunities, though that obviously comes with a heavy dose of caution should a region-lock be imposed.
At this point there is still no publisher named for North America and Europe.