@Fae, or anyone whom is able to answer the question. I just read the changelog for Omada 5.9.9 but as there are 11 changes, whereas 8 need an additional firmware update from a switch, a gateway or an EAP, when can we expect those firmware updates? Is there a roadmap and which versions do we need for these changes? Just out of curiosity when will we be able to use those features?

See below for an overview of the numbers which require an additional firmware update:
 

1. Added the Tools page to the Site view,. New firmware updates for Omada devices are required and will be released later.

2. Added support to download device info, New firmware updates for Omada devices are required to obtain complete information. 

3. Added support for the following IPv6 features, require firmware updates for Omada devices:

4. Added the CLI Configuration, requires the firmware upgrade for Omada

5. Added the "Lock To AP" feature. No firmware update required requires new firmware updates for Omada EAP

6. Added the "SSID Rate Limit" feature. requires new firmware updates for Omada EAP,

7. No firmware update required

8. No firmware update required

9. New firmware updates for Omada EAPs are required.

10.. New firmware updates for Omada Switches are required.

11.. This requires new firmware updates for Omada Gateway.

Edit: some typos
New edit: Changed number 5 as it has been confirmed it does require a firmware update instead of what was said before.