One day, each CCP writer will not have their own image of each faction and portray vastly different, contradicting things...anyway, from the live devblog, CCP are aware of this, and will be consolidating everything, hooray!
One thing I thought would be interesting to explore is the social/wealth classes amongst the four main factions in EVE, and how they vary, and how the measure of wealth may vary between them.
Gallente - There are various, oft-clashing "facts" regarding the state of Gallentean citizens. In the Foiritan years, there's a comment about "unemployment nearing zero", and TonyG's own favourable leanings to the Gallente in TEA have them in a "near-utopian" state. But then, you've got "the poor numbering in the millions", and the idea that native citizens (ie. ethnic Gallente, Intaki, Jin-Mei and Mannar) occupy the "white collar" jobs and immigrant citizens (ie. Minmatar) occupy the "blue collar" jobs. Gallenteans may measure wealth by these two categories.
However, in The Burning Life, we were demonstrated a "megalopolis" on Gallente Prime. It is described as a massive, vertical pyramid, with multiple tiers with its own flora and working roadways on each level etc. Abraxas said "there was no social segregation" and that lifestyle moves with whatever wealth level you're on. So, the richest may inhabit the apex, but their lifestyle wouldn't necessarily be different from someone on the mid and lower tiers.
At any rate, I have the theory that Gallente society is divided between the "haves" and the "have-nots". The "haves" may have extremely comfortable standards of living, with all the excess and luxury that have been associated with the Gallente over the years. The ethnic makeup of these populations might be overwhelmingly native, but there's likely to be "immigrant success stories", too. The "haves", I feel, would be what is described by Abraxas in the Burning Life.
Then, the theoretical "have nots" are the ones that occupy the "undercity" of these megalopoli, and were not included in Abraxas' description, but were likely kicking around somewhere. These would be the failed migrant workers, the homeless, and those employed by shady businesses and so on.
I think this "stark contrast" and bipolarity might be something that defines the Federation's social class levels, and there may be no "clear, middle ground". Either you got it (holovisions in the bath, drones serving your whims etc) or you don't.
Caldari - A bit more easier to describe I think. Thanks to the meritocracy, I believe that there will be a much more, broader spectrum of wealth levels. You'll be able to divide it into multiple categories...workers, foremen, managers, junior execs, and so on. This contrasts with the Gallente's theoritical thing of having a more juxtaposed measure of class.
Though, the State also has a crapload of homeless too, or "Disassociated". They likely fall beneath the standard measure, ie. You've got the 6 categories of Caldari wealth levels, then those who are outside it altogether. I do wonder, though, that if almost everything is controlled by the eight megacorporations, where these homeless may actually be found? Where do they inhabit and live exactly? Abraxas' description of a Caldari city was a more horizontal "beehive" or somesuch, so who knows...though Caldari RPers might have some pieces of fiction that shed some light on this.
Amarr - This one's simple enough. Holders, Commoners and Slaves. However, I think the Amarr have their wealth measured differently to the Gallente/Caldari, putting less stock in materialism. While their lives may be extremely comfortable and extravagant, they might lack the things that a Gallente might consider "wealthy", ie. "You earn the same as me but, by the gods, why doesn't your car have holoscreens in it?! Are you mad?". Considering they have slaves to do their work (and, I imagine, in Holder households, they are likely to be the equivalent of houseservants), they use of drones is unnecessary, which may be found in Gallentean households.
A house owned by a Commoner family, for example, will be very comfortable, but it won't necessarily be dripping with ease-of-living technology. In fact, the Amarr are quick to shun the Gallente for their excessiveness and hedonism, so I would doubt they've got all the silly little things the Gallente have.
Minmatar - An odd beast, this one. The poorest and "underdog" of the four, but even saying "poor", they are still one of the four major powers regardless. I would say I'm stumped with this one, though I imagine their "slums" would be the worst of the four, prone to gang violence (ie. tribal violence) and other such things. A middle class citizen may be similar to the Amarr, in the sense everything for them is good and comfortable, but they lack those lazy Gallente's excessive appliances.