Yeah no, these aren't fake.
First off the faker would have needed to have access to Onua, of whom we have yet to see a picture of without the preliminary marker covering his mask.
Secondly this is the first image with a clear view of not only the Pakari, but of the combiner models too- which are using brand new pieces, so unless the faker custom modeled those then there's no way he faked it, and I highly doubt he could have done that in the 16 hour time frame between these being released and the images Just2Good gave us.
I've worked with photoshop for 9 years, there's no way they shopped those combiner models.
Trust me, I've been in the fandom since 2001, I've seen fakes every single year- I know how to spot them
Also they have watermarks because they are confidential and were not meant to be released.
Also also, as Kahi mentioned, the person who uploaded these pics told us about details in the final sets that we didn't know about BEFORE Just2Goods video went public, such as the changed Hau. There's no way he could have known that unless he either A. worked for LEGO, B. found Just2Goods source, or C. Saw them in a catalog (which is what happened).
These images look funny because they are preliminary and confidential, not because they are fake.