Below is a list of the tiers and their builds in the order in which you would get access to them:
'The Half Cab' tier
Gives you access to development and prototype builds which are not actual game builds in themselves. These are standalone builds which would contain features being developed or prototyped, enhancements to existing features, etc. An example would be a a build with a grey-boxed gym for testing out verts & transitions. The estimated delivery date to have access to these builds would start as of January 2018 and would continue through to final release, whenever a build is made available.
'The Early Grab' tier
Gives you access to the earliest 'game build' in the form of Steam Early Access or Xbox One Game Preview. The estimated delivery date for this is May 2018.
'The Tre Flip' tier
Gives you access to Alpha & Beta builds of the 'Final Game'. They come after the Early Access / XGP and just before the Final Game release. The estimated delivery date for these would start in January 2019 for the Alpha and later for the Beta.
'The Fastplant' tier
Gives you access to the Final Game build. This is the last build that you would be receiving as it would contain all the promised game features and what we consider our official Game release. It would no longer be in Early Access / XGP as of this point. The estimated delivery for this is July 2019.
Should we come really close to reaching a stretch goal, then we will evaluate the situation for that particular stretch goal and see if there's anything that can be done to go ahead with it, without putting the features quality at risk.
As for stretch goals that have not been met, well, it's not over til it's over. Obviously we won't be able to attack those goals until we find the necessary funding, but we won't give up. We want all those awesome features in Session and some way or another, we'll try to find a way to make sure it all happens.
But, with the help of everyone, we can make sure that the stretch goal features are secured from the get go. :)