Slide show of images from the trailer
Andy Serkis appears to be Ulysses Klaw. Since Marvel does not have the rights to adamantium, Ultron must be made of vibranium, hence Klaw, hence more Marvel goodness.
Still no pics from Fantastic Four which has been in post production since June. There must be a reason they don't want anyone to see the Thing. If Fox does a bad enough job, to protect the property, Marvel could get the Fantastic Four back.