Lenovoは、7つのスマートフォンをAndroid 5.0 Lollipopにアップグレードする予定であることを発表しました。これには、Vibe Z2 Pro、Vibe X2、そして新たに発表されたS90とP70が含まれます。

Below are the smartphones that will receive the Android 5.0 Lollipop upgrade:
According to Lenovo, the upgrade will arrive via Over-The-Air (OTA) in the second quarter of 2015.
The company also noted that the upgrade only applies to the models "bought from retail market; operators customized or contract models are not covered."
source: Lenovo
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Upgraded mine to 5.0.2 last 05/01/15. Some Lenovo apps like anti-virus were missing, some features are integrated in system setting, cylindrical transition animation missing.
Details are indicated in the URL below:
https://forums.lenovo.com/t5/K-S-and-Vibe-Series/The-ROW-Z2-Pro-K920-just-got-the-Lollipop-upgrade/td-p/2073142