Eric Coughlin
Veteran
Highly unlikely on their next camera being 6K full frame as Arri has specifically stated in their announcement that it will be a 4K Super35 camera. There's speculation that a later iteration of the LF and 65 would have this new sensor and then be 6K and 8K cameras, respectively. But considering the Mini LF is still new I imagine it will be a few years before an LF replacement comes out, as Arri is not Red in that they don't cannibalize and devalue their own cameras on a yearly basis.6k fullframe, 4k S35mm is certainly a strong possibility (it meets the Netflix 4k requirements), but then they'd lose the benefits of oversampling (which have served the 3k for 2k finish Alexa variants so well).
Arri have compression for Arriraw these days. It's Codex's High-Density Encoding (HDE) which shrinks Arriraw files by 40% with zero mathematical loss to image quality. Unfortunately it's currently a purely external measure, so you shoot uncompressed Arriraw, then have to re-encode it when you store/ingest it.
The next gen of their cameras will no doubt incorporate HDE into the actual recording, giving them significant savings in media storage.
As for integrated battery plates, they've always been interchangeable on Alexa. You can detach a v-mount and swap it for a gold-mount easily enough. And having it attached to the camera body saves a HUGE amount of weight compared to all the rigging gack required to attach a whole separate battery plate on to a camera body that doesn't have one (not to mention introducing power cables as an additional point of failure on the camera).
I believe HDE only works for RAW and not ProRes. Correct me if I'm wrong. And as John pointed out, Red has a patent on compressed internal RAW. I don't know how Canon got away with RAWlite; perhaps it's not true RAW.
Perhaps if comparing to the Mini's battery mount which is separate from the camera, but that's mainly due to the location of the fan on the back of the camera, so they'd have to relocate the fan exhaust in order to mount to the back of the camera. Even then, I'd still prefer a battery mount that could be changed out. The Amira's changeable battery mount on the other hand weighs just a few ounces (probably no more than if it was a built-in mount) and has no dangling cables. I see no issues with the Amira's changeable battery mount setup.