ATRIX 4G users rejoice - HSUPA will soon be here, and without any sort of hacky flashing requiring root access. The official Motorola update page for the ATRIX 4G's latest OTA, 4.1.83, has appeared on Motorola's website today. Here's the change log "highlights" according to Moto:

Data Speed
Increased speed at which data can travel on the network.

Data Connection
Improvements to prevent interruptions to data connection.

Improvements to prevent screen from freezing.

Improved ability for users to receive email notifications so you know when you have a new message. Also, improvements were made so that you are now able to use the same email login to access both MOTOBLUR™ and YouTube.

Improvements to call audio function so it is easier for the person you called to hear you. Please note this application is not pre-loaded on the phone, but is available for download from the Android Market.

Increased functionality by enabling Yahoo Email to be sent over a Wi-Fi connection.

Improved International Roaming Warning Message by simplifying user notification so that it only appears on the screen when you move to a new network.

Happenings Widget
Improved Happenings Widget to ensure that you receive the latest updates across the social networks you are connected to such as Facebook, MySpace, and Twitter.

Improvements were made to incoming and outgoing call functionality to ensure a more seamless experience.

The update addresses ATRIX users' two biggest gripes about the phone: the lack of HSUPA (high speed upload) support, and call quality problems.

When will the OTA be arriving? An exact date is anyone's guess, but given this page is for the actual OTA update and not a simple beta change log, you can probably expect it within the coming weeks (I'd even wager the coming days).

Thanks thever1!