As far as I know, that's what KARE-11 is claiming ... "Minnesota's First HDTV News," they proclaim on www.kare11.com, even though they won't be until April.
Keep in mind, there is a MASSIVE, nationwide, market-by-market effort to relocate the frequencies TV stations currently use for remotes (live trucks, newscopters, etc.) The new frequencies for these will all be digital, and stations will have to upgrade for that reason. But I don't see any station replacing any of their remotes until the transition reaches their particular market.
At this time, nobody in Iowa is doing local HD except Iowa Public Television, which has produced some HD shows, but I wouldn't be surprised if one of the Des Moines stations switched in the next year or two. Every time I go there, it seems 8 and 13 are in a fight to the death.