Gw has a tendency lately to leave 1 elite infantry untouched when redoing a line, see seraphon with temple guard and sbg with grave guard. No idea when they will update those kits. Theory floating around was that they left it for warcry update, but it has been 3 years since sbg was released and we still have them..
they will 100% be updated since we got the test models through WHU and I hope its pretty soon