Michael frequently used symbols in his clothing, such as 7's, crowns, stars, etc. One new symbol we see in This Is It is the Ankh, an Egyption symbol for "life". And not only just "life", but historically the Ankh appears frequently in Egyptian tomb paintings and other art, often at the fingertips of a god or goddess in images that represent the deities of the afterlife conferring the gift of life on the dead person's mummy - life after death.
In the photo stills from This Is It, we see Michael in two different jackets which both include the Ankh symbol:
Even the pose on the This Is It poster bears some resemblance to the Ankh symbol:
A related symbol in Egyptian hieroglyphics is the Djed, which is symbolized with a pillar. In a previous post I mentioned how it appears that MJ's hands in the TII poster are pushing against imaginary pillars.
If you want to take the Eqyptian theme even further, consider the goddess ISIS. ISIS is interesting because images of her hold an Ankh, and her name is within the context of the "This Is It" title. Michael's head is actually right below the "ISIS" in the movie poster.
Just some research on wikipedia will tell you that "Isis was instrumental in the resurrection of Osiris (her brother) when he was murdered by Set. Her magical skills restored his body to life after she gathered the body parts that had been strewn about the earth by Set.This myth became very important in later Egyptian religious beliefs."
On the MJHDI forum, a member named 2good2btrue discovered that during the funeral, the dancers have the ankh on their jackets:
Did Michael study Egyptian history and incorporate that into This Is It? He does have a precedent of incorporating Egyptian images into video, so one more thing for us to ponder...