Late yesterday evening, our QA discovered an issue with the Terraria Hardmode update for iOS. This bug is significant enough for us to make the decision to delay the release slightly while we work to fix the issue.
We want to provide the best gaming experience we can and feel that this bug needs to be addressed for that to happen.
Starting immediately, we will be spending our time addressing this bug and making minor polishing improvements with the goal of releasing the update at the same time as the Android version. While we do not have a solid date at this time, we hope to have one for everyone very shortly.
We apologize for the delay and thanks for your patience.