Quote from Fr0zen_Flame >>

will the transfer allow you to scan or somehow input a physical D&D book you own, and receive an electronic copy on D&D beyond, seeing as you already own the book?

 There have been no announcements about free books.

Quote from Sgtmcgrath2323 >>

Will Wizards own my homebrew content created on D&D Beyond?

Wizards has no intent of taking ownership over user content you put on D&D Beyond, and the Terms of Service will not grant us such rights. The permissions we will need for user content will relate to allowing us to operate the D&D Beyond service, including displaying that content on our site.

5.2. License to Wizards. By posting or submitting any User Content to or through the Websites, Games, or Services, you hereby irrevocably grant to Wizards a worldwide, perpetual, irrevocable, royalty-free, non-exclusive, and fully sublicensable license to use, reproduce, modify, adapt, publish, translate, create derivative works from, distribute, perform and display such User Content (in whole or in part) in any media and to incorporate the User Content into other works in any format or medium now known or later developed.

seems their own TOS says otherwise

 It does not actually, that's a license to use it, and the normal common one you'll find everywhere on the internet, since it's what lawyers have determined is required to do things like display your comment. If you use Google Docs, Roll20, Twitter, DeviantArt, or really anywhere that has user content you've probably been under exactly that license. Including on Fandom. If they wanted to own your content they would have you transfer or assign the copyright to them.

Quote from Flamepulse >>

I didn’t see it mentioned anywhere but has anyone asked yet if we will be able to get free digital content when we buy the physical books? Or even be able to convert the books we already bought?

 There have been no announcements about free books.

Quote from Jasper_Shimmerstep >>

will we still be able to use the VTT system?

 D&D Beyond does not have nor support any VTT.

Quote from TheOdderDan >>

I wonder if this will mean going forward that physical books will come with a digital redemption code. I've often heard people balking at having to re-buy digital copies of book here when they already own the book (or vice versa).

This sort of redemption scheme isn't uncommon. DVDs and Blu Ray discs used to come with a card / code to redeem a digital copy. Texts books will often come with a similar thing to access online resources, practice tests and labs, etc.

It's just a matter of having the redemption code obscured or not readily accessible before purchase to stop people just grabbing the code without purchase. Usually this is done by shrink wrapping the book and/or having the code in a sealed folder/envelope in the book that needs to be opened and sometimes scratched off to reveal the code.

Quote from Mattoo >>

Will WotC ever give us some way of transferring physical copies of books to D&D Beyond without having to buy a separate copy through D&D Beyond?

 There are no announcements about free books.

Quote from MarthylanFonk >>

Will I keep my account as it is in the transfer or do I have to pay a subscription fee to gain access to my and other D&D content?

 As long as you don't delete your account and thus agree to the new terms nothing will be affected by this change of terms.

Quote from Zaidya >>

This should mean you have licences for translations afterwards. Will there be other languages available soon? 

 There have been no announcements about other languages. There is an Italian edition that was made available several years ago to test the level of use.

Quote from UnholyKnight9 >>

How will effect people who use foundry? My players use it to help them with their character sheets.

 D&D Beyond does not support any third party. Scraping is still something you agree not to do, and there is no public API. The tools used often break the site too, and disabling them is the first step in all troubleshooting with issues.