It's done by Wizards of the Coast so wondering whether digital will be on dndbeyond.  Haven't heard any mention.

https://hypebeast.com/2019/9/dungeons-dragons-vs-rick-and-morty-starter-set-pre-order-buy

Probably will be the same situation as the Stranger Things set. This is more likely a hasbro product thant WotC, so the timeline will be skewed.

It will probably be available for purchase when it comes out, but not able to preorder.

It is available for pre-order but there doesn't seem to be any special frames, backgrounds, and etc. :( Shame.
Link: https://www.dndbeyond.com/marketplace/source/the-lost-dungeon-of-rickedness

I bought the pre-order, nothing showing yet. I am hoping that there are some unique features that will be added once it actually drops. 

I wish they had an official release date on the pre-order page. I bought it thinking it was soon, and I couldn't seem to find any definite info on DNDbeyond. Though I see on the dnd.wizards web page that it states it will be released Nov 12th.

It really should be listed somewhere on DNDbeyond though.

Will there be official Rick and Morty minifigurines now for 25-28mm?

Doesn't look like it, looks to be adventure, rules, character sheets and dice like the essentials and starter kits.

I meant 3rd party mini's, I figured its not with the box set as it is not stated.

I assume by third party, you mean like Nozlur's and blind box ranges (both of which are actually WotC first party products)

Again, I wouldn't expect that because, like the Stranger Things box set, it's unlikely to have a miniature range.