While North America and Europe is about to get floor 8 of the Mushin’s Tower in March 2 with the Unchained update, Blade and Soul China is getting the Infinite Tower later this month, a 1v1 challenge which isn’t actually infinite, as it is comprised of 100 floors (thanks 2P).
The Infinite Tower will certainly be a part of the western version of Blade & Soul some time in the future, but for now it’s China players that are getting this new content. Each floor includes a duel with an NPC and you get to pick an additional skill before each combat. If you succeed in defeating an enemy in a short time, you may skip some floors as a special reward. The best players will see their names in a leaderboard.