Most people seem to be content with the generic green pig man. However, a vocal minority are really itching for a more interesting orc.
As for Imperials, I was thinking it would be cool to have the real Cyrodilic races, rather than the stock Imperial they've been making. And since the Imperials seem to have been beaten with the ugly end of the retcon stick, as of late, we might as well take this opportunity to make them look cooler. I personally want the TESV Imperials to be an accursed fish people who crawled out of the ocean.
And, while the true climate and geography of Cyrodil seems to be up in the air right now, we might as well (try to) settle it for the fans, at least.
You can read the pocket guide's description of Cyrodil http://www.imperial-library.info/pge/cyrodiil.shtml
And http://img.photobucket.com/albums/v620/thelobo/Picture5.png?t=1278556577 is a screenshot of Cyrodil in Arena.