UPDATE 3-Hochtief gears up for unit IPO, tweaks FY outlook

* Q3 new orders 7.2 bln eur, above Rtrs poll avg of 5.8 bln

* Q3 EBT up 16.6 pct at 141.9 mln eur, above Rtrs poll avg

* Lifts outlook for full-year order backlog

* CEO says Q4 so far on track

* Shares close down 1.8 percent amid confusion over guidance

(Adds comment from source on IPO timing)

By Eva Kuehnen

FRANKFURT, Nov 12 (Reuters) - Hochtief (HOTG.DE) tweaked up its 2009 outlook and expects global economic stimulus packages to boost next year's results, it said on Thursday, preparing the ground for a listing of its Concessions unit later this year.

"For our company, I expect economic stimulus programmes to significantly make an impact next year," said Chief Executive Herbert Luetkestratkoetter.