Starting new site with HTML or migrate later?

I’m about to start a new site and I’m wondering if you think it’s worth using the beta in order to begin from scratch with the HTML structure as opposed to migrate to it later? And if so, when do you guess that the features in this beta release, particularly the HTML structure, will go into the main release?
Thanks!

I like to the run the beta for at least a month. So we will probably be launching it as the main release in late February. Ideally the migration works flawlessly and it doesn’t matter to much on running the migration, which is currently what we’re working on in the beta. Have a great day.