The following London database updates are announced by Ancestry.co.uk.
London, England, Baptisms, Marriages and Burials, 1538-1812
UK, Prison Hulk Registers and Letter Books, 1802-1849
London, England, Births and Baptisms, 1813-1906
London, England, Deaths and Burials, 1813-1980
London, England, Poor Law Records, 1834-1940
The number of records in each database is given, but not how many are new, or it could be just an update to the explanatory material.