I wonder if we'll be able to overclock the LPDDR5. There shouldn't be any problems on the SoC side, considering it officially supports speeds up to 7500MT/s.
On the Deck they were able to overclock the LPDDR5 to 6400MT/s very easily and it only consumed 0.5W more. In this case they're probably using 6400MT/s memory, so an overclock would be out of spec.
Where did you read that? They're already bundling a 65W supply. Their power supply upgrade is the one with the HDMI out, but are the giving it away for free?
The batteries are Li-Ion and there isn't really any tech out there with substantially better energy density. What we could get are thicker batteries though that would probably result in them not fitting the back plate. On the other hand, the back plate is easily removable to replacing it with a 3rd party plate that houses the bigger batteries.
I'd much rather have a slightly thicker and heavy handheld with e.g. a 75W.h than the weird fixation they showed about not going over 600g.