Cyrodiil would be kind of boring, if you ask me. Its lack of real natural borders means you'd kind of have to cover the entire province as well, in which case I'd much rather see bordering parts of Morrowind or High Rock.
Actually, here's an idea - how about we make the Imperial City revisitable in the fashion of Mournhold? The city would be enclosed so you wouldn't be able to venture out, but I'd love to see Bethesda re-envision the city on a larger scale, more truthful to the original PGE description.
Woah. I just read it.
Refayj's famous declaration, "There is but one city in the Imperial Province,--" may strike the citizens of the Colovian west as mildly insulting, until perhaps they hear the rest of the remark, which continues, "--but one city in Tamriel, but one city in the World; that, my brothers, is the city of the Cyrodiils." From the shore it is hard to tell what is city and what is Palace, for it all rises from the islands of the lake towards the sky in a stretch of gold. Whole neighborhoods rest on the jeweled bridges that connect the islands together. Gondolas and river-ships sail along the watery avenues of its flooded lower dwellings. Moth-priests walk by in a cloud of ancestors; House Guards hold exceptionally long daikatanas crossed at intersections, adorned with ribbons and dragon-flags; and the newly arrived Western legionnaires sweat in the humid air. The river mouth is tainted red from the tinmi soil of the shore, and river dragons rust their hides in its waters. Across the lake the Imperial City continues, merging into the villages of the southern red river and ruins left from the Interregnum.
The Emperor's Palace is a crown of sun rays, surrounded by his magical gardens. One garden path is known as Green Emperor Road-here, topiaries of the heads of past Emperors have been shaped by sorcery and can speak. When one must advise Tiber Septim, birds are drawn to the hedgery head, using their songs as its voice and moving its branches for the needed expressions.
That sounds so epic.They could have made a game just based around the Imperial city and surrounding area.