Episode 100: Who will return to Mystic Falls?

According to IMBD we could see some known faces in episode 100 next thursday 23rd of January.
500 Years of solitude will bring back characters like:

• Janina Gavankar (Tessa), Sara Canning(Jenna), Matthew Davis (Alaric), Daniel Gillies (Elijah), Claire Holt (Rebekah), Joseph Morgan (Klaus), Kayla Ewell (Vicky) and Malese Jow (Anna).

So we are now thinking if they could appear in flasbacks, be just a prove that the veil is stills not closed or be something to do with Bonnie now that she is the anker to the other side. This information may not be 100% true, cause as we said it was found in another website. This hasn´t been yet confirmed by the CW TV but we would love to see all this faces in the episode 100 with any doubt.