I think it would be nice to have a chat inside the game between players..
or sending a message to players..
because its add an exciting part to us players
when there is an interaction between our co-players in the game
it keeps the game alive..
especially that we can give taunt to other players after the battle..
or giving comment on enemy's troops or whatever..
i have played other games ..
and having a chat in game or sending messages in game..
is really good...