I make no secret of the fact that I'm no fan of the PT. However, both your suggestions 1) & 2) above would improve RotS. The secret(s) would still be pretty obvious, even to a new viewer, before ESB, but the slight element of mystery would help the audience to enjoy the revelations when they came, rather than (ahem) feeling they were just watching a previously told story.

I also like daveytod's idea. Taken together, these three would help remove some of the worst moments of RotS, namely: the two "birth" scenes (the twins and Vader), Leia on Alderaan and Luke on Tatooine.