@Talion - the Tallarn Rough Riders have been available for a long, long time. But they may have been Mail Order only, not sure???
A lot of people seem to be thinking that GW have made the decision not to do new Tallarn models because of the current situation in the Middle east. I think this could be valid
As to new stuff - FW do seem to be taking up the slack - they have made new weapons teams, a sentinel and the camelesque things over the last year or so.
@Swordwind - I think those guys are the Vostroyans. But I think they are only going to be in metal