Also, from the pictures I've seen of Morrowind, there aren't many (if any) gates that go into a city, like in Oblivion. (I didn't play Morrowind) Will Skyrim be like this?
In Morrowind, all the cities except for Mournhold, the city added in the Tribunal expansion, were in the same world space as the rest of the game, meaning you could just walk into them without a loading screen. Mournhold was located entirely in interiors disguised as exteriors (By which I mean to say they were considered interior cells by the engine, but they had a sky and weather like exteriors.) and could only be reached by speaking to a certain NPC. Some cities in Morrowind had walls but most of the time these walls were pretty unimpressive and never actually seperpated the city from the surrounding areas.
As to whether it will be like this in Skyrim, I'm not sure, there are some who believe it will, but I don't think there's actually been official confirmation.
f I had my druthers, I rather enjoy an Elder Scrolls game where the entire game was played out in a massive realistic 1:1 sized city. Or I’d rather have just ONE city where all the effort they would have placed into making nine ‘puny cities’ could be placed into making one somewhat believable city of proper density and majesty.
And thus, Grand Theft Equine: Tamriel was born.
Also, if city interiors are treated as entirely different cells they could be larger then their initial appearance suggests.
That's really not a good thing. This isn't the Tardis we're talking about here. Unless the lore actually says a building, city, or any other location only accessable via a loading screen is larger on the inside than it appears on the outside due to some trick of magic, I want the interiors to be fully consistent with the exteriors, saying that having outside areas and inside ones in seperate world-spaces allows the scale of things on the outside and inside to be different is not an endorsemant for such a design, if anything, it's an argument against it.
Anyway, saying that the five major cities are "massive" is pretty vague, though when I hear Bethesda say "massive" I'd expect something on the scale of Vivec or the Imperial City, but I highly doubt that's the case. Considering that the map is said to be about the same size as Oblivion's, I can't see the game having five cities all on the scale "massive" would lead one to expect. More likely, the cities will be similar in size to the average city in Oblivion, give or take a bit. Myself, though, I'm not so much concerned with the area a city takes up, because let's face it, if the game world is scaled down, it's only logical for the same to be true for cities too, rather, I want each city to feel more unique. I want cities to be able to make me WANT to explore them because they're so unique and so interesting, not be places I visit only because I get a quest to go there or I need a place to sell or buy items as they often tended to be in Oblivion, despite the unique archetecture each city had. Making the cities larger would just be a waste of space if you can't make them worth exploring.