Yes and no. Just because they are sold at Wheaten Ameraucanas doesn't necessarily mean whoever was breeding them was better or worse than whoever bred the EE's at making sure there wasn't a single bird that was homozygous for blue eggs in their breeding pen. If you spend any time in the Ameraucana thread, you will note some people have issues with birds hatching with clean faces which shows not only the rooster has a single bearding gene but also at minimum one of the hens does as well. That shouldn't happen in stock that is well selected and is 'pure bred'
I would put pretty good odds on your EE based OE on having the blue egg gene but as it has already been alluded to, you cannot be certain until they lay eggs.
I have chicks coming from Max Strong out of Texas, who seems to be a pretty serious breeder of Ameraucanas. I see his birds in the winning poultry shows.
The other source I have coming is from BYC's peachick. She seems to be well known for having really nice blue eggs. (Hatching eggs from her, fingers are crossed!) I'm very excited about getting my start with these wheaties!