Shouldn't Wolfheze be a 2-4 player map? 6 players on that map would actually be retarded as it was small enough even in CoH1 to be a 1v1 map.
The sizes are only an estimate at the moment, and it will only be decided upon once the conversion is being planned.
However, consider that most 2 players maps from COH1 can support 4 players comfortably, and so on up the scale. Wolfheze is one of the larger 1vs1 maps, and we can't rule out the possibility of it supporting 4 or more players.