An actual screener version is popping up on the torrent sites now. Watched it last night. I was a little disappointed in Ultron as a villain, it felt like his "power level" was a lot lower than it should have been. For the final showdown I'd much rather have seen all the Avengers taking on a single, but incredibly badass, Ultron rather than hordes of mindless one-shottable robot suits whose only threat was in their numbers. Also how quickly QS and SW switched sides felt way off. They spent a decent chunk of time establishing their deep-rooted hate for Stark and then they basically get one line to say "wait, you want to kill humanity, whelp guess we are Avengers now!"
The other thing that had me a little confused was the credits scene with Thanos. I mean, I get they are setting up the Infinity Wars, but I'm trying to figure out what happened in AoU that would prompt him to start taking direct action now. Was he expecting Ultron to somehow bring him the stone, did he only learn that Loki had lost the scepter (and hence the gem) due to the events of AoU? Maybe I'm overthinking it, I dunno.
Overall another solid effort for Marvel, sure they've had better moments in other films but I still enjoyed it.