the ODST Firefight changes are certainly the most likely to meet the axe for this season; between the broken flood carrier AI and the missing Stealth Elite's, this wasn't really finished so much as this was more of a mid-development test to garner feedback on the current direction they are taking things in, while they work out the nitty gritty of the voice work and AI functions, completely understandable as far as I'm concerned.
this could mean Season 9 is going to favor more of the Firefight side of things, which if true, means they might make some significant improvements to Reach's firefight mode as well, such as restoring drones and Elite players ability to assassinate ODST NPC's. they may even go into having CGB functionality for both it and ODST.
I can see what you mean by it could be a development build and they wanted others to get a taste of how things are currently while receiving feedback, yet I wonder if this feature had a mid to late season release, would that be enough time for it to come out polished? Don't take this the wrong way I most definitely wouldn't want the feature to come out rushed or unfinished, I am just not a game dev and I can not determine how much time is needed for these features, could be more or less time than we expect. So with that being said, the completed and polished feature would either be a mid to late season release (being the best case scenario) or a season 9 release, either way I'll still be really happy that it's becoming a reality!
With the discussion of Season 9, that could be anyone's guess. I know a lot of people want H2C/A to get some love but I also know how hard it is to work with their engines, so a firefight focused season isn't too far off from being a possibility. Thank you for adding your thoughts!