Briefly: is it kosher yet for me to ask questions about this year's exam? (I'd really like to know how to do the B3!)
Quoting Kent Merryfield from AoPS:
Please do not post or discuss any Putnam 2014 problems anywhere on this forum until Sunday evening (approximately 7:00 p.m. EST or 4:00 PST). I will create 13 topics at that time, one for each problem and a general discussion topic. Please wait for me to post those topics and put your comments there.
One reason for waiting until Sunday evening is that while most students will be taking the exam on Saturday, there is a provision for some of them to take it on Sunday.
AoPS is not Math.SE, but I think the same advice applies.