They never updated their initial claim that they were planning to build additional mills in WA, but if I had to guess:
1) They put any expansion on hold early last year when production problems with the second mill arose.
2) Judging by the Q4 numbers, those production problems have been resolved.
3) Given that they've completed payments on their Indonesian manufacturing site, which is several times larger than their WA facilities, I would expect any further expansion of manufacturing capacity to happen there. When that happens might depend on whether they decide to build one big mill there, or expand in modular fashion, with several smaller mills, built one at a time.