I don't have a citation right now, but am reporting feedback from various reliable sources over the last year or so.
InnoGames have a record of telling less than the whole truth in their publicity releases - as is their right, for two reasons:
- Design trends are fiercely competitive and they may choose to hide certain development directions from competitors;
- A forum moderator told me that some players have invested astronomic amounts into their games, which lays InnoGames open to litigation if basic game changes cause those players to lose all or part of their investment. For that reason they may tend to word their releases in such a way as to protect themselves.
If I find a citation I will let you have it.