Get out of here 
I think this is by design in technical approach, bug in business approach . But there is a workaround. You have to set the content type of the page layout you're trying yo create a page from, as the default content type on the needed pages library. Then, when you create a page from a page layout that is bound to the default content type of the pages library on the site ( yeah I know, there are so many dependencies : P ), you see the default values of the fields on the bound controls. But, as you can guess, this can not be a workaround for two different content types living on the same site, at the same time 
Since, there can only be ONE default content type in a document library or list.
kurtlubakla