Talks are taking place between the LTB, the Greater London Authority's development arm the London Development Agency, and Mayor Ken Livingstone on the details of the campaign.
This will form part of 'Visit London', Livingstone's three- year blueprint for tourism, unveiled last month.
Extra funding totalling £7m has already been earmarked for marketing, now and over the next three years.
According to LTB communications director Rachel Smith the campaign is set for a pre-Christmas launch.
PR will be coordinated by the LTB in-house team and may involve additional support from BGB &Associates, which supported the last major PR push, 'The Greatest Show on Earth'.