It's worth noting that this is not the whole schedule, as more will be added over time. Even the homepage on the Ignite site says that there will be over a thousand sessions. Remember, there are around 500 sessions for Microsoft's Build 2019 conference, and Build is a fraction of the size of Ignite.
What's particularly interesting this time around is just how many sessions a search for 'Windows 10' will turn up. Over the last couple of years, there really hasn't been a lot of talk about the firm's flagship OS at its premier events, and any talk that did happen was under the 'Microsoft 365' umbrella. Now, you'll find sessions like, "A look ahead to the future of Windows 10 Pro and modern devices", and "Future of Windows and Office".
Microsoft 365 is a combination of Windows 10, Office 365, and Enterprise Mobility + Security, so just the fact that a session has the words "Windows and Office" signifies a big change.
You'll also notice that there are no sessions related to the company's Surface hardware. It seems likely that these sessions will be added later on, possibly because of the expected Surface hardware event in October.
Microsoft's Ignite conference will once again be held in Orlando this year, but it will be a bit later in the year. Rather than in September, it will be from November 4 until November 8.