The main barrier I see so far to using GitHub Projects is that a project is tied to a single repo. I have dozens of repos for my business. Consequently I would no longer be able to see a single view of all the work my dev team is working on in a single board. When that is addressed, I'll move to GitHub Projects off of Trello. If GitLab already does that, I might choose that instead.

I prefer moving at Gitlab :) It already has that kind of functionality.

For some projects can be so obvious, but maybe You are interested to have all the projects in your account in trello and visualize in a glance, or maybe can add more things in the card, or whatever. Or maybe you have a lot of boards with different things, or you not using github for example. But for some proejcts or simple projects i think can replace trello

I'm sure most developers are excited to give Github a chance over Trello (me included), but I'm most interested in seeing how Trello responds (if they respond at all). Who knows what moves Trello might make to try to hold on to their users? Probably comes down to how much money Trello makes from developers; it might not even be a big deal for them.

Although we currently have a software solution in place, I am excited to try out to see how Github's new solution may fit in with project management needs. It is so great to be able to manage tasks and to delegate and manage work requests in a central place. Great news

I mean to me, a kanban board is a kanban board. This completely wipes out the need for waffle.io and trello.

It'll be nice having everything in one place, especially when collaborating with people around the net who might be new to your project.