I heard that the level spread for group missions has increased from 15 to 30(?) but is that only for Heroic Adventures or all group missions? i.e. can a lvl 101 group with a lvl 85 to go through HoT progression?
It was always 30 levels max in the normal world, thought there was also the 50% + 1 level rule as well which meant you could not hit the max until your over level 90 or so (60 can group with a 90). A 85 and a 101 will have no trouble grouping together.