I would not believe everything you hear from the carrier. That also has been rumored since last April that it was going to be discontinued before the summer started and it's still for sale regularly. When it's discontinued, Apple will remove it from their lineup and you will likely read about it here first.
Do you really think the front lines people at an ATT retail store would have inside knowledge of what Apple will be doing???
I think at best its just a speculative rumor, that they're just passing on. Apple may very well discontinue it, but I find that highly unlikely. I think the SE fits a need and the sales of the SE (at least from what Cook has said in the past), is such that apple is very happy with its performance.