ZTE had a webinar(!) about the Axon 7 last night. Taken from XDA:
*
they listened to the beta testers and community chatter and added the capacitive buttons back into the US base model (whyyy)
*this change is what delayed the release slightly
*gold model will be released first (July 27th) followed by the quartz grey (Aug 16th/17th -- BestBuy and webinar disagreed on date) -- no plans for the silver one in the US
*pre-orders are available now at ZTE (their website and eBay), Amazon, Best Buy, Newegg, and B&H for $399
*notification LED is present and RGB (he specifically remembered red and green being there)
*they've heard the feedback on the bootloader unlocking and been in discussions with R&D about the best way to do it -- they said it's an "when" not an "if", but it won't be at launch because that would meant another delay
*it will have Tap to Wake
*they've been working on the imaging code constantly -- every update they've done has had changes for it
*it is band compatible with Sprint and Verizon but will not work with them at launch -- if they can get it certified, it will probably only need an OTA to work with them
*updates will be on a monthly schedule to line up with Google and to not over annoy users with frequent OTA updates (the only exception was for a critical security updates from Google)
*they are planning the 6 GB/128 GB model to be released in the US at some point in the future, but they wouldn't commit to any time frame
*they are working with Google on getting the phone DayDream certified
*they are committed to an Android Nougat release as soon as possible but wouldn't comment on a date (he seemed to imply they were working with Google on this to get it out more quickly)
*microSD slot was limited to 128 GB [although, I see no reason why it couldn't use higher than that, since most of the 32 GB limited ones work fine with larger capacity]
*they will be posting the rest of the answers on the ZTE USA Community Forum over the next few days, including if the retail partners are included in the Passport 2.0 program [I'm not sure what distinction was being made here, since they had already said the full warranty would apply from any retailer]
http://forum.xda-developers.com/axon-7/help/model-qa-zte-usa-webinar-t3417965