We can all assume that, in the spirit of innovation, 343i will be introducing some new AA's to War Games. However... I'm curious as to whether there are any ones that were in Halo 4 that the community feels strongly should or shouldn't be brought back. I'm going to go through all of the ones in Halo 4 and explain my reasoning for them.
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Jet Pack - This should be brought back but should be severely altered. As opposed to being able to hover in the air for 10 seconds at a time it should be changed so that it is more similar to the jump boots in UT3. As opposed to being rather slow and lasting for 3 seconds it should be a very quick and powerful upward movement for about 1 second. This would allow the player to do much of the same stuff but would require much more skill and would have far more margin for error.
Hardlight Shield - This one I think is nearly perfect as is. No changes necessary
Hologram - This one is perfect as is. No changes necessary.
Regeneration Field - This one should make the cut but it does require some change. Because we traditionally want to keep the flow of combat moving in level design and having somebody plop down a healing field and wait it out is contradictory to this goal, we need to control the power of the AA. The changes I would suggest are simple. One well placed BR burst into the AA would instantly cut it off. Also it would only last for about 75% as long as it does in Halo 4.
Active Camo - I tend to think that this is the one AA that was in Halo 4 that should not be brought up to Halo 5. However, it might be worth testing different fixes for it to see if one works. One possible solution would be to make the camo significantly weaker. Another would be to make a support upgrade or something that outlines active camo users while scoped in.
Thruster Pack - This one is perfect as is. Actually it might be worth it to give this one a little distance boost. I couldn't find too many good uses with this in Halo 4 unless I was doing trick jumps at the man cannons in Haven.
Promethean Vision - I loved the balance for this AA in Halo 4 and think it should be brought up to Halo 5 as is making only changes based on what is necessary for the new games arsenal and gameplay.
Autosentry - I was never a big fan and it wasn't too powerful. I'm pretty indifferent as to whether it is brought back or not.