Big yes to Lionheart! I love the look of her blue costume, and - as was said - she's the very last classic/pre-Disassembled Avenger, and we need her to complete that group.
This sums it up nicely for me. But if they do make a Lionheart, it's gotta be blue.I'd have to think about it. The look is cool, but she's not really a character I have any attachment to ... I've never read anything with her, and am really only familiar with her from Wikipedia/ Marvel Encyclopedia perusals of Avengers membership.
I think I'd be more receptive to her if we got dedicated Avengers wave more often: she'd be a natural low-tooling new character to slot into one of those, and I'd be happy to pick her up if the BAF was somebody cool.