LGW - "groups 1 and 2" called at the same time from the holding pen (my guess is there were only a couple of group 2 silvers on board so they extended group 1); on the plus side, the priority lane into the holding pen was zero queue for me which was nice
Outstation - "groups 1, 2 and 3": so basically the exact same as the old style "all cards at once" - this was a bus gate though, so priority boarding was pretty meaningless