Ubuntu, arguably the most popular open source operating system, will be dropping support for 32-bit packages starting with the 19.10 release, while users who wish to continue running the outdated architecture can opt for Ubuntu 18.04 LTS up until 2023.
Canonical, the company behind the Ubuntu distribution has also disabled upgrades for Ubuntu 18.04 to Ubuntu 18.10 to forestall users from running interim release with just six months support, which decision follows the fact that next LTS release, Ubuntu 20.04 won’t have support for 32-bit systems, as Ubuntu 18.04 is the last LTS version to support 32-bit systems.
At the moment there isn't much information on the features and changes that will be coming with the next release, but it’s certain that GNOME 3.34 upgrade will add to its performance improvements.
However, the official Ubuntu 19.10 release schedule has not been made public, though there is certainty that it will be arriving in October 2019. And the Testing weeks will most probably occur in July/September, before the release date. Albeit, the Ubuntu desktop development team have commenced the Testing weeks from Ubuntu 18.10 and each release will be preceded by just one Beta milestone.
The Ubuntu 19.10 development process, on the other hand, had set the Beta release for September 26, 2019, which will be followed by the final release on October 17, 2019.
Update: Canonical has made a u-turn about its plans regarding the ditching of 32-bit i386 packages for Ubuntu 19.10 and 20.04 LTS, following feedback from the open source community — specifically WINE and Ubuntu Studio users.