Considering how Xeno Fifield looks I don't have high hopes for the execution, to be honest.
Are you a pessimist? If the rumour about 200 millions budget is true then A:C is 60-70 millions more expensive than Prometheus. It's more money to spend and make sure things will work. Prometheus was sometimes a bit cheesy in terms of designing department. But now they've got new production designer. New blood. Guys who worked on Mad Max as well. And regarding Xenos, it's not like we won't see practical effects. Yes we will. Everything will depend on the shots. Close ups will have non-CGI Aliens. I'm pretty sure.
The 200 million quote is the only think that makes me pessimistic. That makes Covenant the most expensive R rated movie of all time, and if you add in advertising and all that, you have to figure around a 400 million break even point. That's a huge uphill battle for this film.
I still think the 200 million is gonna come out as bullshit since Prometheus didn't even make that before Home video release. It came close, but still, yeah, didn't quite make it. That is a huge budget for a niche horror movie to recover, and it certainly won't have Deadpool crossover potential. I am hopeful it makes that money back, but I think i would be even more hopeful if it has a Prometheus budget attached to it.