khorum
Murder Apologist
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The Whent symbol is already in the show, in fact it was on a shield in the first season and Catelyn pointed it out.My guess is that the trailer scene features Oswald Whent. You can only see it for a milli-second when the swords swing by, but I think his helmet has wings over the ear. Whent wore a characteristic helmet featuring a bat motif and some of the fan art does show him with 2 swords despite there being no such indications in the books.
Meanwhile the dualwielder clearly had the Targaryen Dragons on his cuirass:

It can't be Hightower, it can't be Whent and the Daynes' sigil has also been mentioned. So unless they fudged the canon and made the kingsguard wear Targaryen livery for the Tower of Joy, maybe it's from a different flashback.
But I'll bet they just made them wear the Targaryen armor to lend more weight to the value of whatever they were guarding in the Tower.