Absent from this year's Mobile World Congress in Barcelona, Spain, the Huawei P9 smartphone will instead be unveiled April 6, 2016, at a special event in London, UK.

As with the Huawei P8, Huawei chose not to announce P9 at Mobile World Congress, instead launching it at a separate London event.
Invites
recently sent by Huawei indicate that the P9 will launch on April 9.
The invites use the hashtag "#OO" as well as the slogan "Change the way
you see the world", which most likely alludes to the twin 12MP rear
cameras on the P9.
The #OO hashtag on Huawei's event invite makes
pretty clear reference to the twin-camera system heading to the back of
the upcoming handset, developed in collaboration with Leica.
Rumours
surrounding the new Huawei smartphone are growing ahead of its official
presentation. Specialist websites expect specs including a 5.2in Full
HD screen, a Kirin 950 octa-core processor, 3GB of RAM, a USB Type-C
connector, a digital fingerprint reader and a 12-megapixel dual-lens
camera around the back.
All this is still speculation at the moment. Either way, the P9
will be big news as Huawei seeks to maintain its position as the
world's third largest smartphone manufacturer by offering well-specced
premium hardware at reasonable prices.
Source: GizOK