UPDATE: The ArcheAge forum has a new post with a small note from XLGames, developers of the game:
Posted on behalf of XLGAMES: Dear ArcheAge players, You may be aware that there has been a business transaction involving Trion Worlds. XLGAMES is currently resolving issues to ensure that there is no harm done to the users since our ArcheAge fans are of the utmost importance to us. XLGAMES will do its best to settle any matters with the involved parties in a speedy manner. The release date of the Relics of Hiram 5.0 Update will be decided and notified to you soon. Thank you for your support. -XLGAMES Team
A brief post has been written to inform the ArcheAge community that the Relics of Hiram update is going to be delayed. Originally scheduled for release today, the note indicates that the team is working towards a new indeterminate date to ensure server stability. The delay for stability has also come at the hands of Monday's revelation that Trion Worlds was sold to Gamigo. It remains unclear if Gamigo will continue publishing AA or if it will revert to developer XLGames.
All, The Relics of Hiram 5.0 update is currently postponed from its original release date in North America and Europe. We're currently in the process of re-targeting a new date and apologize for the last minute notice. Some of you may already be aware that this is due to the recent business transaction between Trion Worlds and Gamigo Group. Our current focus is to ensure live servers remain available for play. Thanks for your support. -Khro
Source: ArcheAge forum