The cheapest level of Business Class award space on United--that is also the only kind of award space bookable with partner miles--is pretty wide open in the early winter months of Australia's winter, which is early summer in the United States. May and June 2019 have the most days available, and with a few scattered seats open in April, July, and August. All beds are fully lie-flat.

This is news because it's not common to see this many Business Class award seats open to Australia, a notoriously hard destination to get to with miles.

October 11 is the day Singapore resumes services on the longest flight in the world between Singapore and Newark. Singapore previously flew this route until 2013 when they got rid of the one type of plane they had capable of the long haul flight. One of Singapore's new A350-900ULR, loaded only with premium economy and Business seats, no economy, will make the ~18 hour journey in each direction.

While the Singapore to Newark route was announced (and went on sale) at the end of May, premium cabin award space wasn't too hot until just recently.

American Airlines has released a batch of Business Class award space to London (some totally lie-flat seats, some angled lie-flat) from many cities, January 2018 through the end of the calendar (April). This is news because American Airlines doesn’t normally have so much premium cabin award space, and the majority of the other award space bookable with American Airlines miles to Europe is on British Airways which incurs ridiculously expensive fuel surcharges.

I would act quickly if you want to book this award space, as much of it has already been snatched up.