After a Japan-only announcement, Sony's keeping quiet on the possibility of a global launch for the Z4.

Xperia Z4

Sony this morning made the Xperia Z4 official, in what was its lowest-profile announcement for a flagship-level product in years. It's a somewhat confusing half-upgrade from last year's Xperia Z3 that sees Sony slimming down its high-end offering, cutting back on battery capacity, while packing in a more powerful Snapdragon 810 CPU. Much of the rest of the hardware, including the 20.7-megapixel rear camera, appears almost identical to the Z3.

Even more confusing are Sony's rollout plans for the Z4. The phone has been announced for the Japanese market, but none of Sony's other regional arms have issued press releases of their own.

Sony's not committing to a wider international launch for the Z4 — yet.

Xperias Z through Z3 were global products, so what's going on here? In a statement, the Japanese company didn't commit to any broader international launch for the Z4, but nor has it ruled out the possibility. A Sony spokesperson told Android Central it's "considering the feasibility in other markets," which leaves the door open for a European or Asian release. Sony Mobile is an established player in both markets, so both are equally possible.

Alternatively, Sony fans could have to wait a few more months, possibly until the IFA trade show in Berlin this September, where Sony normally unveils its fall refresh.

Are you tempted by the Sony Xperia Z4, or were you hoping for more from the latest Z-series phone? Shout out in the comments, and join the discussion on the Xperia Z4 forums.