Beginning on July 1, 2013, all displays will include a new Data Storage Reliability Upgrade. To support this software, you will need to move to the latest patch of your preferred version of PowerVision (2.3, 2.4, 2.6, etc.) Enclosed you will find details on how to work with the latest displays as well as information on how to upgrade existing units to support the latest Data Storage Reliability Upgrade. In addition, please refer to the end of this post for links to software packages which are referred to in these documents.

Please read this document first. It describes the upgrade and gives information which will help you determine your best upgrade path. This document describes details for most customers on using PowerVision to support and distribute the Data Storage Reliability Upgrade. This document describes using the optional Field Upgrade Tools which some customer may find useful in specific scenarios.
Here is a link to the latest PowerVision 2.6. viewtopic.php?f=3&t=760
Here is a link to the latest PowerVision 2.3. viewtopic.php?f=3&t=759
For customers on a different version or OEM versions, please refer to the appropriate forum location for downloads.

[UPDATE] Please note that the bootloader has been updated to version 2.3.20019 with the following changes.
1. Removes the Murphy branding.
2. This loader prevents loading of an older loader which may be invalid on new hardware.
Here is a link to the new Boot Loader which is compatible with ALL releases. [UPDATED 9/25]
Here is a link to the Field Upgrade Tool which is referred to in the Optional "Reliability Upgrade Field Instructions"

Documentation says "all displays". Does not mention PV750 by name. Is it not affected?

You are correct. The 750 is not affected by the changes and therefore there is no need to update or upgrade any 750 hardware or configurations at this time.