Seeing as the goal for Boinx is $400,000 (3x the first unlock, added to the already-met goal of $100,000) I can only imagine the goal for Espresso/HitList will be significantly higher as well. Wasn't last year's MacHeist top-tier goal pretty high?
Past bundles have been pretty reliable, though it always takes a while to get the last app unlocked (maybe even with mere days left before the deadline, I can't really remember). I'd imagine that MacHeist is very aware of the current economic times, and given data from previous years they should have a good idea of sales patterns, and be able to adjust goals accordingly. Unlocking Espresso will only boost bundle sales, which is the entire idea here!
I got a previous MacHeist bundle primarily for CSSedit... which has served me very, very well. Like everyone else here, I'm really hoping to get Espresso, especially as I need an integrated JS/CSS/FTP solution! As for XHTML validation, that's a good question. I'm playing with the demo today, and even CSS auto complete isn't working (as it does in CSSedit). It appears to be very much a first version release, and I'm counting on it making major strides forward. Better code support, SVN, etc. Maybe that's too much of a gamble, but based on the brilliant CSSedit, I trust Espresso 1.x/2.0 will be superb. Unfortunately, I doubt I can pay for a bundle while the possibility of Espresso being added, while theoretically "going to happen," isn't entirely certain.
Awesome MacHeist this year, thanks to everyone involved!