Actor Oliver Phelps (George Weasley) briefly
mentioned starting work on the final films,
Deathly Hallows, on his Aston Villa Football Club
blog - where he occasionally discusses his personal viewpoints on recently-played games and players - back on March 19th:
Quote:
I have been doing some pre-production work for the new Harry Potter film over the past weeks and I'm looking forward to getting back to it.
It is unknown whether or not Oliver (and James) have begun filming the last installments of the Harry Potter series; when we find out we will update on it.
Harry Potter and the Deathly Hallows will be released November 19, 2010 and July 15, 2011.