Microsoft have revealed Xbox Live Rewards - a bonus scheme based on your gamerscore that could see you getting a "whopping" 2 percent rebate on Xbox Live purchases.
The birthday gift mentioned is worth $0.25 or equivalent (maybe it's a button for your avatar?). Overall, this reward scheme, available on to paying Xbox Live members is fairly weak compared to what PS Plus members get in return every month. But at least we're getting something in return for the gamerscores we have amassed.