We have no idea what "unveil" means.
You could be right: it could be a vehicle ready for production, a prototype, or a mock up with "this is what we are thinking of doing".
There is no way to know.
That said, the focus on the car is pointless. A robotaxi is not about the car but the software plus the network. The box that is used is secondary.
How is a robotaxi going to recharge? Without a driver, there is no way to do this without wireless charging. Is that being developed/rolled out? How will that be handled?
What about the application? Cant have that without an application? While not a difficult matter, still needs addressing?
How about the financial program? This will likely be more than just Tesla vehicles, how is that handled? What will the cuts be for vehicle owners versus company? What about a rating system? How will they distinguish from nefarious actors versus those who are not?
These are just a few examples of what is required within the ecosystem. But, alas, people are going to focus upon the car when it is really secondary.
These are all great questions. I'm super curious to see if any or all will be answered.
When you said:
I honestly do think it's both valid and justified to be skeptical of the things Musk says.
Look at this:
Source
Model Y price will go up by $1000 in April...
Source
Instead of the price actually going up, the price came down.
Did Elon knowingly lie? Did Elon make a mistake? Did Tesla have to change their minds? Who knows... it doesn't really matter.
I seriously think it's wise to have some skepticism with announcements from Tesla and Elon. I don't at all think I'm smarter than him or know better... but he's famously inaccurate.