For a simple test of your terminal's bce-supportingness, type this:
python -c 'print "\x1b[44m\x1b[2J"'
Your whole screen should end up with a blue background.
Seriously, Apple: what's up? Is there some maximum amount of goodness that's allowed in Terminal.app, so after fixing all the other things, you had to balance it out with some additional sucktitude? Or maybe I'm missing something really obvious here?
PS: I should mention: this isn't just idle concern. It actually does break terminal apps. Most full-screen apps which draw a background color will now look wrong, because the background color will only appear under the actively drawn text. For a good example, try mutt.