I would like to see an option to be able to spawn bots in custom games so you could practice with weapons like the BR. and have the option to set the difficulty like Easy, Normal, Heroic, and Legendary. i think it would be a great addition to the game.

what i want to see is skulls in the campaign

1johnn1 wrote what i want to see is skulls in the campaign

They probably will include skulls in the campaign, they have been in every Halo since 2.

New vehicles and weapons and maybe Ai in forge

I'm just copying this directly from a thread on Reddit.

Right now it seems like the only real selling point for Halo 5 is the Halo name. I like that they are going back to arena style gameplay with balanced starts, but Halo 2-3 still offer this with, in my opinion, better gameplay. I know I haven't played the beta yet, but I have seen the footage, and I can honestly say I wouldn't buy it if it didn't have the Halo name attached to it. I believe Halo 5 is destined to fail. The core gameplay has changed too much to keep older players around, and hasn't changed enough to draw new players in.
You know what would ACTUALLY modernize Halo 5 instead of sprint(a feature games have had for 10+ years)? Dedicated servers for customs. 343 can set it up where you can buy a server for a monthly fee and host games. This would seriously be incredible and would promote online tournaments, further increasing attention to Halo 5. People have been bitching about host advantage for online tournaments since Halo 2. Why are we still letting this happen? The first HCS cup was played online last night, and the semi-finals grinded to a hault for about an hour because teams were bitching about hosts advantages. But of course 343 doesn't want to do this, they want to add f*cking sprint instead. Seriously, we're losing huge publicity for online tournaments because pros are sick of this host bullshit. It just looks plain bad when new players view Halo tournaments on Twitch and all they see is grown men sitting around arguing about host.
Next, they could add a server browser similar to Battlefield 4. Imagine hosting a 24/7 FFA on Midship where you can come and go as pleased. Furthermore, imagine being able to view your dedicated server from your computer where you could kick people, change the map, and apply moderators). What about a vote to change map system in a custom game like other games have had for 10+ years. Imagine being able to host a 24/7 Lockout, Guardian, and the Pit custom game. I know Halo 5 won't have these maps, but imagine what it would have been like.
What about a clan system worth a shit? Imagine being able to have a clan homepage in game. Clans would apply only to Big Team Battle sizes. Have a RANKED BIG TEAM BATTLE playlist. Imagine how many websites would pop up supporting clan Big Team Battle tournaments. This would further increase attention to Halo 5 for new players.
Make a forge system where you can MAKE MAPS ON A PC AND UPLOAD THEM INGAME. This would be GROUNDBREAKING for consoles. Review websites would actually be writing articles on Halo 5's innovation, not articles on why sprint is good/bad for gameplay. If this isn't possible, just make a forge system worth a shit. Regularly add player made maps into playlists and eventually tournaments to provide incentive for people to forge. Once again, imagine how many forge websites would pop up, further increasing the popularity of Halo 5.
Seriously, why the f*ck does anyone on here want to settle for average? Halo revolutionized FPS shooters on consoles. Now Halo 5 is just desperately playing catchup to other shooters. I am mad at sprint, not because it changes gameplay, but because it's a piss poor attempt at modernizing Halo. It's desperate, cheap, and lazy. Innovation will save this series. Conforming won't. Halo 5 needs features that will actually draw new players in. Features that people will hear about and say "I want to **** try that right now".

For it to be exactly like Halo 2 except add in forge

I want to see the MC become the new Didact and Cortana become the new Librarian. I believe the fit perfectly into that role.

Well there is a lot of evidence to support that master chief is actually the didact, that would be cool to see.
But honestly I want halo to go back to its original roots so badly.
I hate every change there has been since Halo 4.

I agree with you a little bit. I really dislike the game play, it's too "COD style" now. On the other hand though, I really like where the story is going. There is more emotion involved this time around and it really sucks you in. I just hope they don't kill of the Master Chief, that would be frustrating as hell. I would rather him and Cortana ascend.

Maybe gun improvements? That would be nice like way better shotguns & range.