From the Official cosplay guide posted on halowaypoint the 15th of June, we get some infos on the customization.
This infos appears on each part of the armor. They provides tricks for cosplay, lore and (maybe ? ) customization possibility.
Page 27, Plate carrier
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Core identities : The Mk. VII’s armor plating is compatible with a wide range of attachments and enhancements that might be focused on specific mission parameters. (Chest attachments like helmets ?) - Now it’s personal : Spartans often will apply the emblem of a fireteam or a more personal “logo” to their armor. Make sure the enemy knows exactly who they lost to. (Personal, fireteam or spartan company logo ? tag number on chest ?)Page 34, Shoulder pad
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Shouldering the load : Shown here is the UA/AGATHIUS shoulderpad, manufactured by Misriah Armory and fully compatible with the Mk. VII Mjolnir core. (Incompatibilities from core armor and armor parts ?)Page 48, Forearm
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Easily attached : The forearm is a great place to add additional design elements that can prove both aesthetically pleasing as well as functional. Spartans often employ TACPAD devices in order to integrate communication modules or allow for data processing and analysis. In cosplay mode, such a device can easily be achieved by mounting a smartphone in clever ways, giving the wearer similar abilities as their Spartan counterparts—provided your Wi-Fi signal is strong, of course. (already confirmed forearm attachment) - Aegis wing : While present in an experimental state in early prototypes, the production run Mk. VII does not contain a variable geometry energy shield field shaper. Unfortunately, neither do most cosplay versions. ( A jackal shield like was under development. Scraped idea or just for the lore ?)Page 62, Handplate
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Emblematic : The handplate armor can be another great spot to add personality to your armor. It’s a great place to place a personal emblem, logo, or number designation. (Personal, fireteam or spartan company logo ? tag number ?)Page 76, thihg
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Side arm security : The thigh armor can also be a potential spot to mount a weapon holster, letting you keep your M6D Magnum or Mk50 Sidekick close at hand. (Return of the M6D post launch or just already created cosplay prop ?)It maybe just some funny comment but it could be real customization options.