So, we've already seen that power armor can have jump jets attached to it. But what else do you want to see? Weapons, mods?

Personally, I'd like a back-mounted Y-rack to fire mini-nukes from. Mobile Infantry, here I come!

Recoil absorption in the arms.

Wrist mounted flamethrower! Boooooba Fett, svckas!

I wouldn't mind different vision options. Such as Thermal vision and night vision as well as an internal scope in the helmet for viewing things in the distance.

Thiiiiiis.

A visor that shoots laser beams from my eyes!

A lore breaking revised HUD that uses a projected holographic display instead of gauges.

An arc reactor.

Repulsor rays.

Unlimited flight capacity.

Jarvis.

Yeah. That's about it.

Don't forget power armour FOR YOUR POWER ARMOUR

Doh! How could I be so stupid. You are absolutely right. Supermutant Behemoth Buster armor too.

Combined with the Jetpack, I'm seeing it happen.

Can my power armor just go into https://youtu.be/uvKhXhpssF0?t=44s when I get pissed?

WHERE?!?!

*blindly knocks Joker's jetpack switch*

I'd like a really beefy power fist like attachment for unarmed characters. Punch out a deathclaw, kick his sand castle and steal his girl.

Upgraded actuators for speedier movement
Enhanced sensors package (night vision, infrared, X-ray )

WAAAAAAAAAAUGH!!! *flies through side of building and into radioactive FEV monster*

A back-mounted, multi-missile launcher pods over each shoulder

Power Fist on Each hand when you don't have a weapon equipped. I tried to make a mod of it in previous titles, but i had little lick in the process.

Autocannons !

http://www.sarna.net/wiki/Autocannon

A belt frog for my drinking horn.

Sick skullface paint for my helmet and a pair of retractable chainsaws for my gauntlets.

Water breathing unit so that I can walk along the bottom of Boston Harbor.

Back mounted jet propulsion system to allow me to mach dash towards enemies or do insanely fast strafing maneuvers.

DeathClaw Buster!

Something to increase walking speed would be nice.

I can only think of two worthwhile attachments

1. Beer can helmet

2. Air conditioning

I always remember how in Fallout 3, the stealth armor looked liked it was designed to be used in conjunction with power armor. I think it would be cool if there were under layer armor types that you could wear along with the power armor that would add bonuses or special abilities to the unit as a whole.

A silly one.... You could stick four of your companions in power armor to somehow form a giant power armor Voltron type guy.

Tho it be a stretch to justify it lore wise, but a auto pilot mode, Titanfall style where ya PA becomes a temporary NPC companion.