It can be either overvalued or realistic.
Or undervalued...when Elon comes back and says he has bought another 1.5 billion worth of
BTC 
It is very hard to say something is overpriced or not. The price is always looking at the future, as investors are looking at the future, always. This is why we have so much volatility in all markets, because the future is always uncertain.
But the future looks bright for tesla. There is a real "green" theme in the air , and now that trump lost the election, biden is really a more green guy. He will give more subsidies to green companies, like tesla.
Personally I believe that in the future old cars will lose ground year after year... electric cars are cleaner and more silent.
So its make sense to see Tesla worth more money than Ford or BMW.
They claim gains of 5 times the energy, 18% gains in range and 6 times the power. Not to mention gains in manufacturing efficiency and lower cost production.
They plan to license this technology to other automakers in the future. The way that nintendo licensed old cartridge technology over existing technology like CDs/DVDs to earn an extra profit.
Anyways, if someone wanted to claim tesla stock is overvalued, this might be one good place to start.
This is a great example for why TSLA should not be valued as simply just a car manufacturer.
I also agree with hydrogen here. Tesla is developing new technologies, which will be used in many different industries. Thise batteries are more potent, and their tech will be everywhere in the future. This is a tech which may change a lot in our world.
It is sad that Elon musk is a lunatic ...