Hi Olivier
CE PDI only seems to get updated when a GA release is made (ie 9.1,9.2,9.3...)
The git repo appears to be work in progress for the CE work. You could probably compile it yourself but it's a big task of course.
9.3 is currently aimed for this quarter, but it's already moved twice so possibly not.
Security patches have only been made available for Enterprise customers.
According to this a lot of the timeline was covered at https://sourceforge.net/p/pentaho/news/2020/05/qa-with-hitachi-vantara-how-pentaho-and-lumada-data-services-work-together-to-address-some-of-the-most-complex-digital-transformation-challenges-today/
But when you got to https://hitachivantara.bemyapp.com/dataops.next to see the replays it's broken.
afaik there is no central resource for knowing what's going on. Pentaho user groups can be good . The London group https://www.meetup.com/Pentaho-London-User-Group/events/ seems to have good insight but the rest of us are a bit lost.