The playtest material is online, but it will be published in book form when it is officially released.
Well of course not. Unless you're part of the playtesting, you wouldn't.
Online resources are wonderful.
Here's a link to a 6th level Circle of Dreams Druid I play.
The World's most intelligent Dungeons and Dragons Character Sheet.
ddb.ac
Want to check details on a spell? You can grab the PHB and flipping pages, only to find out that this spell is from one of the supplements, you can just click on the spell. Boom.
Character info? It's there, but you still change it yourself. The big difference is you won't wear out your Current HP by repeatedly erasing the field.
I prefer to roll my own dice. Because I just do. And so I generally do. But it's also nice to know that I could, if I wanted, join a game using nothing other than my iPhone.
And there's nothing better for beginners. Making a new character but some of the details are unfamiliar to you? No worries. The system will not allow you to break the rules.
Don't have all the sourcebooks? Also no problem. D&DBeyond, at least, allows a player to share their online sourcebooks with everybody in their group. I have all the online resources (and most of them in paper as well). I created a campaign called "Marks Materials Management". I can send that link to people, they join, and they have access to all of those sourcebooks, same as if I handed them the book across the table.
Not to worry. The availability of online sources will not affect paper publishing.
I use the online and PDF versions far more than the paper, but there's nothing stopping you from using a pencil. Or a quill and ink bottle, if that's how you roll.