Patch Notes
https://forum.square-enix.com/ffxi/threads/61600
Items
New Items - https://www.bg-wiki.com/bg/April_2024_Version_Update_Changes
Items (probably nothing) will be updated in the morning. This month's login campaign is most likely a recap of the last 3 months like they do every 3 months. Also there are no notes in the update preview about more items being added, so I'm not expecting anything.