There’s an early test version of the new Anki up for download here. I suggest backing up your old decks and giving it a test run. It is apparently not meant for regular study yet (as mentioned in the literature here) but just as a trial.

My opinion so far:
Pros – simpler design, smaller files, charts and stats look nicer.
Things in general seem more connected…for example new cards can be created at any time for any deck. For example, if I’m flipping through a sentence deck and realize I don’t know one of the words in the sentence, I copy that word and create a new card in a separate vocab deck or in the same deck but with a different note type (note type is the new card model) all without leaving the original sentence card. This is pretty streamlined compared to the current version.
Decks can also be subdivided and each subdivision can be studied individually or collectively. For example you could have a deck called Vocab with sub-decks for different sources, maybe some are from one textbook, some from another, some from an anime you’re watching and some randomly collected. You could study them all together or one at a time.

Cons – Only one so far: the option to show new cards before, after or during reviews is global, it can’t be changed from deck to deck.