The Following Images that were shown in the post, both of images represent the old and new levels that weren't included in earlier build of the game when released. The Lava Reef Level will be replaced with Stardust Speedway, which means yes, Lava Reef won't be going after Third Act of Burned Ashes/Hidden Ashes, but you'll be able to access it through level select.

With that being said, the reason why V3.5 takes longer is because originally Knuckles and Amy Levels didn't had their continued story, mainly Amy after Far Beyond 2(which the death scene itself is considered as Unintentional to happen, it doesn't mean it was in game bug, it was just me being lazy) so with full ideas developed in mind, Amy will have extension on Collision Chaos that will add Act 2, and Act 3 as well and rework Far Beyond 1-2 and add more levels for her to fit in theme.

I might ACTUALLY, BUT MAYBE, ACTUALLY add more content into sound test adding more sound test codes for the upcoming V3.5 Build.

The Following Update will include surely a lot of content, which is another reason of taking so long, I want to surprise you all with what I've been up lately with developement of that game and somehow be happy with that.

Questions are available regarding the game.