"The commercial deployment of FDD - Frequency Domain - Massive MIMO is expected in 2017, including at China Telecom." (All the MM deployed today is TDD - Time Division.) That comment by ZTE is based on tests with China Telecom and China Unicom, both world class telcos. Huawei and ZTE are both shipping TDD gear. ZTE is a top-5 telecom manufacturer. Huawei has grown so much their sales totals and research budget are now more than Ericsson and Nokia combined.
Backing like this is highly credible. The joint press releases are below. I'm always skeptical until I have results from substantial field deployments, but wouldn't have doubted this except for work by Emil Bjornson, Erik Larsson, and Tom Marzetta. Marzetta invented Massive MIMO; Larsson & Bjornson are respected Swedish Professors.
More than half the spectrum in use is FDD - Frequency Division. Massive MIMO systems in the field today use TDD - Time Division.