Verizon will have minimal, if any, bloatware on the Pixel. I doubt Google would have compromised Verizon completely interfering with their product so that they (Google) could make a quick buck. Google doesn't strike me as that type of company at the moment. Even if there is some bloatware on the phone, it really isn't that difficult to disable that bloatware to maximize a phone's performance. I did that with my Note 7, and it worked really, really well.
For updates, most people are accustomed to Verizon being really, really slow (I know that first hand). But I think Google will have more control than most folks think. Feel free to take a look at the thread I linked before. That information is from a reliable Verizon source.