I was one of the recent admits, so I can't comment on whether or not the earlier ones were fellowship offers, or whether Iowa is simply staggering their admits (past evidence from gradcafe does seem to indicate that the offers have been a bit sporadic). My letter came from the director of graduate finances, and I was curious to see the details that others had received, and if anyone would be visiting (not a viable option for me given timing and distance at this point). Best of luck to everyone.