I can't find an up to date discussion thread on the game. NOA are tweeting new details on the main playable characters of the game. The first one is of Henry Fleming and his weapon details.
https://twitter.com/NintendoAmerica/status/552269576298577921
Get to know the heroes and their weapons in #CodeNameSTEAM starting with Henry Fleming! pic.twitter.com/jOYcdOlAIM
https://twitter.com/NintendoAmerica/status/552269576298577921