Lumia 640 XL will come with a 14 MP rear camera / 5 MP FFC with 5.7 inch display and LTE-Advanced support. We had exclusively reported via our sources that RM-1062 will pack a 14 MP rear camera and a 5 MP FFC. And, we presented some evidence in form of a screenshot from GFXBench listing of RM-1062. You can read all about Lumia 640 XL specifications, confirmed markets, price at our dedicated page (Lumia 1330) page.
It may arrive with 8.7 MP (PureView) camera, 8 GB storage and with 5-inch, 720p display. Read more about it here. Apart from Lumia 1072 and Lumia 1077, variants RM-1074 and RM-1075 have also been caught getting tested.