I looked at the questions as a whole - while one or two smaller questions may be answerable, you are obviously looking towards a total package. One that's not available yet, and one I don't know what Subaru is planning to do with fully.
The Legacy that is available now in Japan does not have a full-size spare. I don't think it will for quite a time, given the amount of space such a tyre would take up in the rear. Tow capacity is completely overlooked in Japan, and it would take some serious effort to find an actual employee within SOJ that could answer that question, because it's a non-issue here. Nobody tows. That's an area that SOA will know well, and they won't know it, or spill the beans on it, until the release of the American Legacy.