Nieźle:

Due to the decreasing popularity of i686 among the developers and the community, we have decided to phase out the support of this architecture.

The decision means that February ISO will be the last that allows to install 32 bit Arch Linux. The next 9 months are deprecation period, during which i686 will be still receiving upgraded packages. Starting from November 2017, packaging and repository tools will no longer require that from maintainers, effectively making i686 unsupported.