Yes, a few of my hubs have received more organic traffic than hp traffic just after publishing them. One of them was a hub about a current event, so it was no surprise it got a lot of traffic. But a few of my other hubs that were more evergreen oriented have gained organic traffic very quickly (within days).
It is possible that there is little credible information showing up on google for certain keywords, so when you write a hub using those keywords, you quickly reach the first page of google. Or it could be something else entirely. Either way, it is a nice surprise to see a hub picking up organic traffic so quickly!