A big congratulations to the entire team at Automattic for launching a brand new version of WordPress.com today. It’s the culmination of 18 months of work, built on a completely new tech stack, and an example of how big of a job it is to reinvent yourself when you’re in the middle of running a service for millions of people.
The first version of WordPress.com did an amazing job for the last 10 years, growing from its humble beginnings to an incredible scale of serving billions of page views a month. Over the last decade, we’ve seen the rise of many new technologies, including smart phones, tablets, JavaScript, Github, and API driven architectures. The new WordPress.com is designed to take advantage of all of them and serve WordPress users for many years to come.
Update: Om has a great post with further details.