Got an answer from Carsten Wagner himself regarding the X5/X6 diesel models IC. He says it's his next item on the list once the E90 IC gets rolling. So fingers crossed. He also mentioned that it'll be plug-n-play version like the E90 one, since the E70/71 has a lot of room in there. Great news, that way I can get a bump from Mega-Speed in my remap programming for a better top end.
Retired: 2005 N52 E90 330i Sport 6AT
Retired: 2007 N54 E92 335i Sport 6AT
Current: 2012 M57 E70 X5 xDrive35D