I can think of times where 1 and 3 would be used, but 2 just isn't used in everyday conversation. If I was telling someone how my day was for instance, and they responded with "I'm glad to be hearing that." I'd probably pause for a second to wonder why they didn't just say "I'm glad to hear that.". An example of number 3 could be if you were coming out of a concert of your favorite band or something, and you really liked it you could say to your friend, "Wow, I'm glad to have heard that."