The WMF Android App team will be ceasing active support for older
devices soon, namely devices that run Android 4.0 (Ice Cream Sandwich)
or older. Our final legacy device release is expected in mid to late
September[0]. This release will remain available on the Google Play
Store for devices running Android 2.3 (Gingerbread) through 4.0 (Ice
Cream Sandwich). However, future releases will only target devices
running Android 4.0.3 (Ice Cream Sandwich MR1) and higher. [1]

* Why this is happening
  Devices running Android versions older than 4.0.3 make up less than
  8%[2] of the Wikipedia for Android install base, and supporting older
  devices requires disproportionate developer time and effort. Focusing
  our efforts on the most recent and widely used versions will allow us
  to provide a faster, more stable, and more delightful Wikipedia
  experience.

* What this means for older devices
  Enjoy a stable and beautiful legacy release for as long as you wish.
  When you're ready for a new device, a sleek and modern app awaits you.

* What this means for all other devices
  Reap the benefits of a Wikipedia for Android experience built to take
  advantage of the latest and greatest Android technology available.

-The Wikimedia Android team

[0] This will be the final planned legacy device release. Allowances
    will be made to enable back support patches of critical issues.
[1] https://source.android.com/source/build-numbers.html
[2] Google Play Developer Console, Current Installs by Device on August
    20, 2015.