During the HL7 FHIR DevDays 2023 Rob Hausam and James Agnew gave a very informative presentation on the current state of the IPS and the API to get access to an IPS. The presentation starts with an introduction, so you’ll be guided into the main features of the IPS.
View the video registration of the session on YouTube 
Apologies for the bad sound with terrible echoes during first few minutes: it gets much better at 1:45