I wouldn't be 100% sure about that from what I was told by someone I trust. Gun to head I think Julian comes back but it is not a given by any stretch.
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Whenever they test the process, there is always a chance you could lose them, I've seen guys that needed to come back end up staying.
With that said, Zach just posted a tweet that was very encouraging, said unless Julian felt he would be taken in the top 30 in the draft, then he would return. So, considering on the top draft sites Julian isn't even listed in their top 60, on ESPN's top 100 board he isn't listed at all, so it seems like at this moment it's a very great chance he returns for his junior year.