Well, when I first saw TPM in '99, I heard that little element of the Imperial March and I thought to myself, "If they put the Imperial March in the prequel(s), then it should also be in ANH."

Now of course, that's already been done. So, now that only thing I can think of for a further enhanced ANH:SE would be to enhance some of R2's movements, particularly with his head when he's in the three-legged position. Aside from that one close up shot of him before meeting that Jawa's, R2 doesn't turn his head at all in ANH when he's in the three-legged position.