The main issue is with domination where you will need more cities to achieve the victory condition on larger maps compared to smaller maps - or without more cities it becomes more (maybe prohibitively) difficult to keep your cities happy due to #-of-cities unhappy.
The main unknown is, for Normal/Standard, what percentage of available resources is it expected each civilization will have access to? As long as the balance play-settings plan for around 70% or so then while it will be harder to get the extra 30% on the larger maps it will be possible and thus not significantly hurt the playability of the larger maps.
I too hold this concern but figure that the different speeds and sizes that are being included in the core game (and available via the standard settings) are going to be balanced for just as they were in Civ4; the special options (OCC, Raging Barbs, etc...) are the ones that likely will be left unbalanced. The other victory conditions have their own challenges on larger maps so the possibility is there for having the victories still balanced relative to each other.
The main unknown is, for Normal/Standard, what percentage of available resources is it expected each civilization will have access to? As long as the balance play-settings plan for around 70% or so then while it will be harder to get the extra 30% on the larger maps it will be possible and thus not significantly hurt the playability of the larger maps.
I too hold this concern but figure that the different speeds and sizes that are being included in the core game (and available via the standard settings) are going to be balanced for just as they were in Civ4; the special options (OCC, Raging Barbs, etc...) are the ones that likely will be left unbalanced. The other victory conditions have their own challenges on larger maps so the possibility is there for having the victories still balanced relative to each other.