I am pretty sure that this is not a deliberate attempt at bias and that you guys are probably reading too much into it. I had read the preview right after it was posted and I know that it started by mentioning that "around a year ago the Panasonic G1 ushered in a new era .........". I had noticed the EP1 related error but didn't have any reason to believe that it is an attempt to mislead considering that they start the article by mentioning the G1.
Plus dpreview has always been full of praise for panasonic m43 cameras. When G1 was originally launched dpreview had given it an overwhelmingly positive review and declared it to be the future etc etc. In short I don't see any evidence to suggest any bias