A preliminary web search seems to indicate that the answer is currently no.
Does anyone know about plans to support java on Win 10 IoT?
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The answer is indeed "Nope". Microsoft Windows is a bit more "closed off" so I wouldn't sit around and wait for Java to come to IoT any time soon. If you want Java, go with a Linux distro like Raspbian.
Regarding your added note:
In the same analogy, you are coming to a swimming pool asking if you could surf here, because you were a surfer for 15 years somewhere in the Pacific. Yes it's a shame you can't surf in this swimming pool, but if you really want to surf in a pool, maybe look at an Intel Compute Stick.
Two years passed and Azul systems (as I understand not without the help from Microsoft) developed Java for Win 10 Iot
Not much is known about the performance/stability yet.