European Factors to Watch-Shares seen jumping back up at open

(Adds company news items) LONDON, Aug 27 (Reuters) - European stocks were seen jumping higher at the open on Thursday, buoyed by gains on Asian and U.S. markets after a leading U.S. central bank official said the prospect of a September rate hike seemed "less compelling" than before. Financial spreadbetters expected Britain's FTSE 100 to open up by 111-127-points, or 1.9-2.1 percent higher. Germany's DAX was seen opening up by 199-275 points, or 2-2.8 percent higher, while France's CA