Yes we as hobbyists have to remember these prototypes are done up in 3D and market tested to some degree before a commitment for production is made. A one off sample tank is encouraging, but I think some distributers get ahead of themselves and start making coming soon claims a little too early.
If this is a Mato tank then I think we will see the M36B and M10 before we see the M3. Although it sure makes sense as they would be using the same metal hull so there hope this will see the light of day,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,one day