Orochimaru's curse seal, when he first put it on Sasuke, looked like the Sharingan's pattern. Now we see it on Tobi's mask. Why would Oro's curse seal have the same pattern as the Sharingan eye? What connection does it have with the Uchiha? And why would Tobi's mask have to same pattern? As if his sharingan wasn't enough to prove that he was an Uchiha. Something bothers me here, which may be connected to the whole concept and predicting the outcome of the whole story.
There was some raving christian dude on the internet who kept saying that all those symbols are 666 cause they look like 6 to begin with XD
other than that i don't see any connection.
UNLESS if Tobi is Orochimaru XD which is impossible...