Six acts each posted a trailer titled "2027 [act name] SEASON'S GREETINGS TRAILER" on their own official channels, and all six went up at the same time: October 11 at 12:00 PM KST. The act's name in the middle of the title is the only part that changes from one post to the next.
The six acts and their trailer lengths are aespa at 56 seconds, Girls' Generation at 53 seconds, Red Velvet at 56 seconds, NCT 127 at one minute and four seconds, SUPER JUNIOR at 59 seconds and TVXQ at 53 seconds.
At the time of writing the aespa trailer carries 225,008 views and 25,776 likes. Each description makes the same short announcement in Korean and in English: it points to the act's 2027 Season's Greetings, with the act's name in the line. The descriptions then list the act's official channels and fandom links. NCT 127 and TVXQ also carry hashtags, and NCT 127's include 2027SEASONSGREETINGS.
The posts say very little beyond the announcement itself. None of the six gives a date, contents, price or sales channel, and the descriptions stop at the act's official channels and fandom links. Any practical details would have to come from a later official announcement.