Motorola has confirmed via their support forum that the company is currently prepping a software update for their Atrix 4G Android-powered smartphone, which launched on AT&T’s network not too long ago. As is customary, though, the company isn’t being forthcoming with what the update includes. What they are doing, though, is allowing for owners of the Atrix 4G who would like to sign up for software testing to do so. These would be beta testers for the upcoming software update. Motorola is currently asking for 1,000 testers, and sign-ups can be found here. You’ll have until 11am Central Time on March 25th, 2011 to sign up. Motorola says that “a list of enhancements” will be provided once registration closes, but that doesn’t mean they’re going to spill the whole canister of beans tomorrow. Here’s what you shouldn’t expect, apparently: HSUPA support.