I've been informed that people think me changing my avatar is some subtle, symbolic sign that the 2020 Collab is starting. In reality, it's a not-so-symbolic sign that I've just had the last one for a bit too long, and felt like changing it.
The 2020 Collab has not started yet. I'm working on all the prep work and it will be starting soon, but at the moment I have other obligations I need to deal with first. The submission window will be longer and open later than it has been in previous years, so don't worry about there being any kinda time crunch or shortended window. As I said last year — having the submission window end right around Christmas time has proven to be inconvenient for a number of artists, collab contributors, and myself, and the plan has always been to shift the collab's submission and posting times back for 2020.
In the meantime, please do not submit anything to the collab until it starts. You can upload stuff now if you wish (keeping in mind that some rules and processes are changing), but the "2020 community collab" tag that currently exists will be wiped prior to it starting officially, and anything "submitted" before then would have to be re-tagged, as premature submissions are not valid.