On Dell's website, when purchasing the 11z, there are two Celeron processor choices, no Intel, no dual core....at least as of yesterday and today. Also, no dual core option on outlet computers.
Furthermore, when clicking on the "Inspiron" section, no 11z comes up....you can only find it when clicking on "all laptops".
I think that they (at least temporarily) suspended the dual core Intel option.
After playing in Dell's site a little longer, I found another way in, offering a choice between the celeron 743 or the Intel SU4100....still no dual core.
I am thinking that they quietly backed off of it, or have just plain run out of the chip for now.