I seem to recall reading in the off-season that Gale's fate wasn't supposed to be ambiguous at all. I think Vince Gilligan had said that it was meant to be very clear what happened to Gale, and he wasn't sure, but was sorry, that fans were uncertain what was meant to happen. In Gilligan's mind, it was absolutely NOT a cliff-hanger in that respect.
Anyway, for this season:
courtesy of:
http://pleated-jeans.com/2011/07/15/...ad-bingo-card/