What they want. Remember, they have to consider any new territory something that could take up a considerable amount of time and cash to pacify. No sense asking for a island that will literally cost more then it ever earns in revenue, for instance
All of the territory they will ask for is inhabited by a majority greek population,the islands are greek,thessaly has a majority greek demographic and epirus is mostly greek(given that the albanians were impacted quite heavily by the consequences of the revolts two decades earlier )
Most of the greeks in those regions want enosis with Greece
Furthermore the party that will secure the deal that will unify those lands with greece will receive a lot of support from the common Hellene as such I would expect it to secure its hold in politics for some time
What the public wants. TO be blunt, what the common man on the street wants, which usually is far far FAR into the Realm of fantasy.
At best
The public wants enosis with greece,tell me would you rather be a citizen of a country that considers you second rate(the ottoman empire is liberalising but we talk about the view of the common man)or join the country that literally represents greeks.
The ottomans imposed harsh tax laws,the chiflik system in thessaly,their refusal to acknowledge christians(see incidents where Christians asked for acknowledgement and the authorities refused)moreover they imposed a lot of taxes on merchants(greeks and armenians)to fund their empire,they took children into the janisaries(even if the janisharies corps has been abolished,the consequences that it has had on the hellenic mindset will not disappear)
So tell me will the common man stay with the ottoman empire or join greece?(of course there were greeks that chose to side with ottomans as well but the common man in thessaly that is suffering under the chiflik sustem will tell them otherwise)
The islands will join greece given that it is quite the trade giant in eastern Mediterranean and they have no reason to refuse.
The only reason I can see epirus not having an enosis with greece is because of the albanian minority in epirus but again the ottomans gutted the albanians two decades earlier(mostly muslims) and I presume the orthodox albanians will have no problem joining greece(the albanians and greeks consider themselves kin and i imagine such an idea has been strengthened given that Hellas sheltered albanian refugees)
What Turkey/Britain is willing to accept. This is the real sticking point. Turkey won't mind handing over some territory, but at the same time, insecurity over their decline, coupled with pressure from their ole rival, to say nothing about possibly paranoid fears of a grand Orthodox conspiracy against them.....
- And Britain, well, they want stability. They might like greece, but that's not infinite, and if they keep stirring up shit to milk it....
Britain almost lost the heptanese in the spring of nations(revolutions of 1848)they know they have a rebellious population that wants to join the kingdom of Hellas furthermore the strategic importance of the heptanese has actually lessened given that the british now hold malta(there is also the ties that greece has with Britain,both in diplomacy and dynasty)
The ottoman empire is not in a good situation,France has not joined the war on its side,neither has the austrian empire(wonder why,they are not in a good position rigth now)
thats what?300.000 troops gone,France will most likely seek concesions from the ottomans,we will have to see how things develop,while Britain can only offer the ottomans 40.000 troops(at the moment only 18.000)so a second flank with a greece that has a good military and forces that number about 40.000-80.000 men is quite the worry and gives greece quite a big leverage and Leo the I/VII will extract that goldmine dry.