According to
http://www.flyertalk.com/forum/jetbl...l#post24986757
JetBlue will charge for the first bag for tickets purchased starting some time next week. Incidentally, JetBlue's current second bag fee of $50 is almost as much as the $25+$35 that other majors charge for two bags.
This will leave quite a gap in baggage fees between Southwest and the other guys. Investors will pressure Southwest to add fees, just as they pressured JetBlue. I have no information either way, but I think the odds favor a second bag fee by the start of 2017.