Not much is known about this episode and even the internet has ran short of speculated synopses. Keeping speculations and rumors alive, CW is spending a huge amount of money in the making of this episode (and a few ones before it as well) as plenty of characters are being portrayed.
There is even a possibility that Jay Garrick will travel from Earth-3 to Central City once again and assist Barry in defeating Savitar. Caitlin’s Killer Frost instincts might again overpower her sound senses, so again Barry and his friends at S.T.A.R Labs might have to get over with the Killer Frost menace and bring their friend (Caitlin) back. Apart from that, there is also some possibility that Savitar will return and cause menace and destruction. We just hope that Barry acts in time and seizes the day.