Fantastic news, even though Trump almost certainly does it for petty, dumb reasons (probably because it will piss some people he hates).
The prosecution of Assange by America was fucking gross, and I think anyone who think it was about anything other than the fact that help exposed American war crimes is extremely extremely naïve.
Now do Snowden.
I agree on him being pardoned for exposing US war crimes like the collatoral murder video. The reason I dislike Assange so much is because he betrayed the cause of whistleblowing that he and Wikileaks purported to stand for. They really fucked things up for everyone being the most visible in that fight. They became nothing more than a partisan hack organisation that withheld inconvenient information and worked hard to get Trump elected. Assange is a racist too, and supports Trumpian white supremacy. This is before getting into his Ukraine fuckery. He is clearly a Russian stooge at this point and anything from Wikileaks can no longer be trusted.
The greatest blow to the cause of transparency and whistleblowing was from Wikileaks and Assange who discredit it.
Trump is pardoning him because, through Stone, who he also pardoned, he worked with Assange to criminally influence his own election in cooperation with Russia (who hacked the material Assange handled in the first place).