Forget Firefox 3.5, should Opera fear Fennec?

OK, so Firefox 3.5 is out and looking good but why should Opera care? After all, the alternative web browser from years back has long since lost that title to Firefox, at least as far as the desktop is concerned. But what about in the mobile market? Opera has been making real progress in penetrating the mobile device embedded browser market. It isn't Firefox 3.5 which should be worrying Opera but rather another Mozilla release: Fennec.