Do you remember those early PT rumors in the British press saying "Computer generated Guinness to reprise role in new Star Wars film". Ha! I would have personally smacked Lucas round the chops.
UPDATED: "Amazing special effects will allow veteran actor SIR ALEC GUINNESS to appear in the next three movies in GEORGE LUCAS' STAR WARS reprising his role as OBI-WAN KENOBI, but as a young man. Guinness, now 82, won many new fans when he appeared as the guru in the Star Wars in 1977 and its sequel the EMPIRE STRIKES BACK three years later. LUCASFILMS plan to release the three new films annually from 1998. But since they are chronologically, prequels to the original sci-fi series Hollywood's top technicians were drafted in to mastermind the special effect. Using computer imaging technology, the studio will superimpose genuine black-and-white footage of Guinness as a young man with color sequences of him as Kenobi in the earlier films. That image will be transferred to a mask worn by an actor with the same height and build as the young Guinness. Trial footage has already been filmed, with the face applied in post production, and the producers are said to be delighted."