Europe Factors-Shares set to rebound; SocGen eyed

PARIS, May 5 (Reuters) - European stocks were set for a slight rebound on Thursday after the previous session's sharp retreat but gains were expected to be limited ahead of the European Central Bank's rate decision and after Societe Generale missed forecasts for its first-quarter results. Financial spreadbetters expected Britain's FTSE 100 to open around 23 points higher, or up 0.4 percent, Germany's DAX to open 22 to 25 points higher, or as much