Please humour me/indulge me for a few moments.
I've been thinking...
Dangerous, I know, but I have.
Captain Jack seemingly has The Doctor's hand (as cut off in The Christmas Invasion). He's thrown about in time and space, both with The Doctor, before and after. How did he get to present day earth in Torchwood? And where are the Cybermen appearing from in the trailer for next week's episode?
Has the rift reopened?
Will Jack get sucked into the Time War, change the end result and thereby bring the Time Lords back into the equation?
And with all this running about in time, back and forth, will it become clear that the Hand Of Omega is not a device, but actually The Doctor's hand? Think about it. For us, in this time line, The Doctor is the first Time Lord. All others (if they do return) come after him.
This might also explain the speculated reappearance of The Rani!
What do you think, dear reader?