Seeing on Twitter a fifth O2 show is on standby.
Montreal rumoured to be Aug 18 - a Friday. I can't see it personally given she hasn't performed a Friday gig since 2001 (with the exception of Buenos Aires in 2008 that had to be rescheduled).
And finally, a user on Twitter says he forecasts two dates in Barcelona the first week of November (maybe that's just his wishful thinking though).