Kepotx answered it pretty well but I got my hand on polygon analysis which is pretty detailed too:
The opening sequence was designed as a subtle history lesson. A brief
reminder of some of the most important historical events that preceded
the events of Game of Thrones.
The images engraved into season 8’s title sequence offers a more
recent history — or, if your theory brain is wired for clues, a
glimpse of the future.
The first thing we see in the new sequence is an image that appears to
be Viserion burning a hole through the Wall, with the Night King on
In front of the wall, the Night King’s dead soldiers wait to enter the
rest of Westeros, on the other side, crows flee south. It’s an
effective reminder of just how high the stakes are this season and the
unforgettable end to season 7.
This second carving seems to be a depiction of the Red Wedding.
In the same house sigil-based characterizations from the old opening, we see a flayed man — representing house Bolton — holding up
the head of a wolf, Robb Stark, to an appraising, but pleased lion,
meant to represent Tywin Lannister who orchestrated the plot. Between
them stands the Twins, the castle of the Frey’s where the Red Wedding
happened. A Direwolf hangs from the arch between it’s two high towers.
There is a third image too but that one polygon used to speculate future events so not incorporating.