So this whole cloning lab thing is that considered canon or expanded universe non canon. i only heard of the clone bodies things a few years ago and have always wondered.
The rebirth of Darth Sidious is considered canon as it was cleared by George Lucas. It is in the realm of C-canon which is just below the movies and TCW. Anything in books or comics that doesn't infringe upon the movie canon is C-canon.
To put it simply, the rebirth is canon.