Happy New Year, Sue, and thanks for sharing these changes for #LTHEchat which has had such a great long run due to I say its participants, not the platform we will not mention by name 
The “where to gather for social media” question is ever ongoing, we did a quick poll last month with not much to say is definitive.
Please share more when the details on how to join are available, and hope you can add the sessions for Open Education Week (Mar 3-7) when we open the event form mid January (ping me if you are willing to be an early tester).
Happy new year, Sue.