Access to the beta is strictly invite only and limited to those who've previously registered for access. Keys are being sent out from tonight. This just marks the beginning of the beta.
Those who wanted to try it out but didn't get accepted shouldn't throw in the towel as more sessions will be running over Xbox Live in the coming weeks, says the studio.
"If you didn't receive an invitation code this time around, don't despair," says Wargaming.net. "We'll be opening up the beta to more and more players every week so keep your eyes peeled."
The beta weekend schedule:
23:00 BST to 05:00 BST on Friday June 28, 2013 23:00 BST to 05:00 BST on Saturday June 29, 2013 23:00 BST to 05:00 BST on Sunday June 30, 2013
23:00 BST to 05:00 BST on Saturday June 29, 2013
23:00 BST to 05:00 BST on Sunday June 30, 2013
Sign-ups for the Xbox 360 beta test for World of Tanks.