Several dozen Discovery Communications team members are in Beverly Hills this week for the semi-annual Television Critics Association press tour. Held in January and July each year, the event provides cable, broadcast and digital networks the opportunity to share with press in attendance some of the most exciting upcoming programming news. Folks from American Heroes Channel, Discovery Family, Investigation Discovery, Velocity, Science Channel and Discovery gathered at the Beverly Hilton Hotel yesterday to host their panels. Here’s what each network announced: American Heroes Channel We know…