Chambers UK have sent out the schedule emails today, confirming their deadlines. The first deadline is December 15, with the second 16 February. So I would recommend you start working on your submissions as soon as possible!
The key points – other than the new submission template – are that they have changed how they are researching the regional/city tables:
“For this year’s research, we are asking for regional, not city, submissions for the following practices only:
Banking & Finance, Construction, Corporate/M&A, Employment, Environment, Information Technology, Intellectual Property, Licensing, Litigation, Pensions, Planning, Real Estate, Real Estate Litigation, Restructuring/Insolvency, Social Housing, Tax.
Submissions for all other practice areas should be provided by city.”
For full details, check out their website.