ANA entered at least into an immediate a close relationship with LH (and their miles&more program).
My guessing is, that UA and LH try to enter ANA into Star-Alliance, but Thai will probably not like it - and may be the two probably new partners (probably Ansett) will not like it very much either.
And I don't know very much about ANA's point of view (in any partnership you do not only get, have to give as well ...).