not saying I am definitely sure, but Chris has mentioned Australia would be from mid to end of 2016 in interviews. And knowing they traditionally end off their World Tours with Australia this may be a short world tour.
Regarding the Asia leg in July, I think financially for them it would be a beneficial move. The short Asian leg of 6 gigs in September this year were all sold out or nearly sold out and it was not even with the 360 stage, whereas so far in the United States sales have been mediocre despite the money put into the elaborate stage, such as Phoenix only selling 6000+ tickets according to billboard. In addition, tickets to the Asian gigs mostly cost quite much more than the tickets to the US gigs. Thus, it would be not that all surprising to me that they opt to not do a second leg for the US, considering they haven't done a formal gig in Tokyo, Taiwan and some other countries they had visited before and how the reception has honestly been quite lacklustre (so far at least)