In MMO games each area or in this case province is leveled. The levels are generally 1-10, 11-20, etc. What levels would you assign to the provinces of Tamriel.

Cyrodiil 1-10
Black Marsh 11-20
Elswyr 21-30
Valenwood 21-30
Skyrim 31-40
High Rock 41-50
Hammerfell 51-60
Summerset Isle 61-70
Morrowind 71-80

bump

Are you kidding? Black Marsh 11-20? It's a freaking death-trap full of poison, insects, predators and more poison. Deep in the marsh only Argonians can survive.

I don't think the areas will be province-sized, though. They should be much smaller, with several areas within one province.

I think it'll be quite balanced overall really. Maybe easiest in the middle, and harder and harder as you go outwards. So the coast will be worst, and the Imperial City the easiest.
Anyway, I don't think it'll get like that.

You mean what level you have to be to get to a certain province?
I think the province you start in depends on the race, redguards in hammerfall, Orcs in orsinium, Nords in Skyrim etc.
They also told us about three different factions, i am curious about that.

Orsinuim ain't a provice, just sayin'.
It's a city state in High Rock. So mayeb Orcs will start out in Wrothgaria?

I always forget that orsinium (spelled right?) is not a province. I think they would start in Wrothgaria then.

This lol, Black Marsh is by far the most dangerous region of Tamriel. But honestly they shouldnt (and hopefully wont) level regions.
You should start your journey in your race's homeland.

If provinces would be leveled zones it would mean that TESO would have either too small provinces or to big level zones and, in both cases, to few zones.

But if we have to rank provinces in this thread then I think it will be something like this (though I expect far more variety within provinces so it's hard to tell what the general 'difficulty' of a province will be.)

Anyway I would assume that -High Rock would generally have more low leveled zones, if Orcs aren't playable the area around -Orsinium will most likely be a high level area.
-Cyrodiil would have some low leveled zones around the IC and other urbanized/high density areas but, if they go for the lore correct jungle approach, could house some higher level zones as well.
-Hammerfell would probably have a relative low leveled area around the coast, but the inlands, deserts and mountains would be more high level.
-Summerset Isle probably has very few monsters so it could be low level area with some local mad wizards that cause a threat to higher level characters. However, the province would be very anti-human so if High Elves aren't playable it would be a very high level zone since the entire nation would be hostile to non-(high)elf invaders.
Both -Morrowind, -Skyrim and -Elsweyr would have mid level wilderniss, some more dangerous areas and some urban areas for low level characters.
-Valenwood would be a quite high level area overall, cities (who should be walking around by the way) would be for lower levels but still more dangerous compared to cities in other provinces.
-Black March, except for some Imperial controlled (at that time?) coastal areas, which will probably still be mid level anyway, the province will most likely be very, very dangerous for non-argoniams. The province, exept for the mentioned coastal areas, was only part of the Empire in name only, even in times where the Empire was at the height of it's power. The Imperials, who conquered the whole of Tamriel (or got control over it, anyway), could not conquer the inlands of Argonia, because of it's climate, disease, beasts and Argonian guerrilla fighters. Except for some specific high level places like dungeons/end game raiding areas and the planes of Oblivion, Black march will most likely be, generally speaking the highest level zone in game.