You must've missed a lot of the info on this forum!Just got mine but it has no headphone socket I posted a thread to ask if that is the norm.
First batch that was up for grabs was, for some reason, without the headphone jack. It had a reduced price and limited availability. The "real" FM3 with the headphone jack is what will be produced from here on and there's been one batch of those sold in the US and (hopefully) one batch in Europe in a few weeks.
You must've just bought in on the first batch without reading that it was without headphone jack.