I’m currently of the opinion that the cries for more years of tax returns are to facilitate the opening of the “Mormon” front. They already played the “rich” and “offshore investments” cards, playing up his charitable donations is a predictable next step, but to be really effective, they need more years of his high earning tax years to make that figure really pop.
I also suspect the timing was brought on by the Tom Cruise divorce bringing Scientology into the media. In two months, the chance to confuse those valuable low-info voters into thinking that Romney is mostly a Scientologist will have mostly passed.
Xenu lives on Planet Kolob. Old Joey Smith just never got around to talking about the body thetans and all that.