I don't really play Clash of Clans, and I love the previous Fieldrunners games, but this development actually doesn't bother me. I think the characters and settings in Fieldrunners are perfect for this sort of game, and heck, maybe it'll finally be the CoC-style game that gets me into CoC-style games. Interestingly, the developer listed in the App Store isn't Fieldrunners' Subatomic Studios, but rather Flaregames who you most likely know from the Royal Revolt! games. Also, according to the App Store Fieldrunners: Hardhat Heroes has been launched in Canada since early November, though it didn't get posted to our forums until just last week.
At any rate, it's an interesting development for the legendary Fieldrunners series and the ultra-hot social strategy game genre. If you have a Canadian App Store account, you can grab Fieldrunners: Hardhat Heroes with the link below, and check out some impressions in the forum thread. We'll let you know when we get word of a worldwide release.
Canadian App Store Link: Fieldrunners: Hardhat Heroes, Free (Universal)