Several RSS feeds are available for consumption from the Arch website. The majority of these are package related and allow feeds to be customized for the updates you care about.
Grab the news item feed to keep up-to-date with the latest news from the Arch Linux development staff.
If you are interested in all package updates , then grab this feed. Note that when a package is updated for multiple architectures, you will see each individual update show up here. Alternatively, you can select a packages feed from the below table that is more tailored to your specific needs. If you are only interested in one architecture, there are a variety of feeds you can choose from. Note that feeds for a specific architecture, such as 'i686', will also include all package updates for 'any' (architecture-independent) packages.