Jacob is now Sayid.
book it
this was my thought too, immediately after seeing it. but after mulling it over, i dont think it makes a whole lotta sense.
a) esau/man in black/smoke monster created a new body, not took over locke's old one. i guess jacob could act differently, but we don't have a whole lot to go off of here
b) seems like flocke knew exactly what was going on from the get-go. sayid woke up disoriented and confused
c) jacob said he's dead
and did anyone else find the opening CGI from the underwater scene just terribly animated? that shark was retarded.