According to Wikipedia, kanji was introduced and imported from chinese hanzi long time ago before Japanese language even had a writing system. From there, Japanese kanji has transformed and evolved from the original hanzi and became what is is today. To my knowledge, it is not clear how long the process took but I'm guessing that, except for modification and simplification, the assimilation has already matured long time ago. Is this true?
Are there any kanji characters that were recently (i.e. post-1946 reform) created or imported from hanzi? What I mean are characters that were previously still not used in Japanese until they were created or imported from hanzi, not characters that had been assigned new meanings or readings, nor characters that had been simplified like 惡 ->悪.
Related to that, is it possible in the future that newly coined words like むかつく to be assigned brand new kanji characters instead of reusing existing ones?