Last week we saw the first images of a new Motorola handset largely believed to be the successor to the ATRIX 4G. Now rumors have surfaced that the phone’s model number is actually “MB865″ and that it packs a 4G LTE radio, which lends credence to the possibility of it launching as AT&T’s first 4G LTE smartphone. According to PhoneArena, which purportedly obtained a leaked internal system screenshot from AT&T, the MB865 will be field tested in a number of markets where AT&T has already confirmed it will deploy its new 4G network. The phone also said to sport an 8-megapixel camera capable of recording 1080p video and is equipped with an HD display and a dual-core processor. AT&T has confirmed that it will launch 4G LTE service in several markets this summer including Atlanta, Chicago, Dallas, Houston and San Antonio. The carrier expects its faster network to be available in a total of 15 markets by the end of this year and has already announced two devices. AT&T may hold off on launching the MB865, or what is now being called the ATRIX 2, until its LTE network is available in more areas, so it is unclear when we will see the phone become official.