I would not take the tracker as the final and all inclusive, detailed statement from United as to which aircraft will get Polaris and which won't. Previous United press releases and interviews made it clear that the plan has been to merely "start" the conversion process with pmUA763 and 722 to get rid of the 3 class ITPE seats (esp. the GF and 8 across business class seats). Other UA mainline aircraft types will follow over time, including the 787 8/9 when their first big check ups come up starting in 2018.