PDF on that site says it all:
SOFTWARE UPDATE GET THE MOST OUT OF
YOUR DROID R2-D2.
Verizon Wireless is pleased to announce a new software update, 4.5.622.A957.Verizon.en.US,
for your DROID R2-D2 by Motorola. This will update the operating system of your device to the
latest version of Android Gingerbread (2.3.4).
Verizon Wireless and Motorola encourage you to download this update.
Device Features:
+ Enhanced security with DigiNotar security patch.
+ Increased browser cross-application scripting for
enhanced multitasking stability.
+ Device will no longer automatically power on after it
has been powered off.
+ Device is enabled with the Wireless Alerting System.
+ Successfully download and save purchased MP3 ringtones.
+ Camera settings will be saved, even after the device is powered off.
+ Increased device stability when keypad is opened and closed repeatedly.
+ Improved 3G data connectivity while using the Mobile Hotspot.
Applications & Widgets:
+ App shortcuts remain on the home screen after moving them from
internal to external memory.
+ VZ Navigator? is now updated to version 7.2.0.452.
+ V CAST Apps is now updated to version 4.4.1.0.
+ Successfully play WAV files.
+ Contact groups will sort correctly.
+ Successfully add application shortcuts or widgets to the home panel
without error.
Email & Messaging:
+ Fixed issue where duplicate text and multimedia messages were
being received.
+ Improved ability to access and receive Gmail messages when the
Mobile Hotspot is turned on.
+ Improved syncing with Yahoo! email.
+ Forwarded emails will no longer remain in the outbox when Smart
Forwarding is enabled.
Verizon Wireless is pleased to announce a new software update, 4.5.622.A957.Verizon.en.US,
for your DROID R2-D2 by Motorola. This will update the operating system of your device to the
latest version of Android Gingerbread (2.3.4).
Verizon Wireless and Motorola encourage you to download this update.
For step-by-step instructions on how to perform the download,
please visit verizonwireless.com/droidr2d2support