Hello - I'll let @Tomer_Sole chime in but here's some information below.
I suggest the EA being discussed is an evolution of current CloudGuard Connect (virtual gateway in cloud). The current released Cloudguard Connect platform does not include remote access VPN services.
The EA (Cloudguard connect for Users) specifically adds remote access functionality with policy, threat prevention, etc. This solution will provide Check Point's entry in the SASE marketspace to compete with solutions like Netskope Private Access and PAN Prisma Access. Of course, the Checkpoint solution will have unique approach the SASE space with some new innovations.
I'm fairly certain you do NOT need to be existing CloudGuard Connect user to participate in EA of CloudGuard Connector for Users.
The datacenter connection to Guardguard Connect "gateway" is via secure site-to-site IPsec VPN. Checkpoint supports GRE but recommends IPsec as transport is encrypted (GRE is not encrypted and not recommended).
Cloudguard Connect Admin Guide
You manage the security policy on Cloudguard Connect "gateway" via either (a) Infinity Web portal, or (b) local SmartConsole using add-in.
How to manage the Access Control Policy of CloudGuard Connect from SmartConsole