Bit of an odd reveal, to put it mildly. Rather than using recreations of the original hardware, they're using SEGA's "ALL.Net P-ras MULTI Version 3" arcade system. Though i'd imagine the emulation will be amazing considering the pedigree involved.
So far, only Fantasy Zone has been confirmed.
It's also not the first time SEGA has randomly re-released an old arcade game(s) out of nowhere, did you know that SEGA ported Daytona USA over to the Ringwide Hardware in 2009, and removed all references to the Daytona license?