My mistake.Yeah the way I see it, Yoda and Obi-Wan gave themselves to the Force before they actually died. Obi-Wan was gone before Vader's blade passed through his empty cloak, and Yoda (albeit on his death bed) gave himself to the Force before he actually expired.
The clothing thing doesn't make a whole lot of sense, but I think we can agree that Lucas isn't going to have a nude Alec Guinnes show up in a barrel or something. Anakin's cloths don't match what he wore before, but I really think they are going to replace the whole body for the box set next year.
Just like the 97 Jabba and Greedo shooting first were just "rough drafts" for what he did in the 2004, I think he will further tweak the Anakin appearance at the end to reflect his actual outfit from the prequels.