We have seen Boromir teased as digital sculpt, we have seen Legolas at various proto sculpt stages and have heard about development progress, we have heard that Gimli and possibly Thorin are in development and we have heard that there are plans for Urukhai (hinted at Lurtz). They also at one point said they were developing Sauron.
We know that they fully intend to finish the Fellowship. Many fans on here are dead set on that becoming a reality (for the first time at 1/6th by a single manufacturer none the less). Unfortunately for me, I have decided not to get any of the four Hobbits as they currently are so completing the Fellowship for me is a little less exciting but that being said, Each of the remaining three will be purchases if they come out as good as Thranduil, that is for sure.
I want more Elves, more Orks, and at least one damn Dwarf! Oh, and a freaking Gollum too!