My guess is that the icon with the play button on it & headphones is a new app. My reasoning is that w/ 5000 members online during the bundle release countdown that if anyone had seen it before someone would've said something then or since.
For Squeeze, which was a new app, we only knew what it was because someone w/ inside info dropped the name for us before the box fell off the truck.
I'm certain Airburst and the other app will show up at some point, since it wouldn't make sense to hint at them unless they are a part of the bundle. Certainly the apps that made the bundle were decided on more than a week ago!
The question is when they'll show up. And when RW will be unlocked (notice that we seem to be cruising towards the 50k mark for MI pretty quickly). If I were MH, here's what I'd be thinking:
Don't tell the unlock point for RW so that it can be adjusted based on actual bundle interest. If you set it too high, then if the week runs out you have disappointed people. Use the first few days to estimate total bundles bought, back it off a notch or two, then announce that midway through the week as the unlock point. This gives people a reasonable goal and spurs interest (keeps people referring/tweeting/etc.).
As for Airburst + app-to-be-named? My guess is they *may* not have unlock points. They'll be unlocked by MH as needed during the week whenever sales slows. That gives them two free boosters to use whenever they think best during the week.
Everybody else confident that all apps will be unlocked and available to us at some point? I think I am.
Just my 2 bits.