24hr+ use/30days+ standby on single charge battery would also be another killer feature! Doubt it... technology has advanced that fast and far yet.
Wrong
It has developed that fast only you and many others don't know yet.
Long long time ago, more than a decade there was this invention in an University in Holland, they invented a battery which could hold a charge more than 100 times than that of a Lithium Ion cell.
Didn't hear much after that.
Reason.........?
There are technologies now like nano wires batteries, they hold many times the charge of a Lithium Ion battery and charge in mere seconds/minutes but there are problems, not with the battery but others.
The main problem is that the bigger a charge the battery can hold the more dangerous they get.
Lets say you've got a battery 100 times the current iPad battery, that means there is 2.5 KW stored in that battery.
Even when it is only 10 times better that is still 0.25 KW
If it gets short circuited it releases that energy instantly and will explode right in Your face.
Not Apple nor any other company would like to deal with the consequences.
Airlines wouldn't be happy with them nor do many other companies.
And then there is the danger of it to damage the economies around the world.
If they release such batteries now there could be viable electric cars in no time, oil companies wouldn't be happy about it, hell I think they might be behind it to block those new inventions by all "means".
There are also other inventions which they just don't release because they are way too advanced for them to release now, like a light-Laser computer which is thousands of times faster than the ones We have now.
But, a battery which would hold charge to power the iPad for a couple of days would be viable and relatively safe, only problem is as always they want to release it in steps so they can earn more money on them.
What I find ridiculous in this world is that the manufacturers charge way too much for batteries, especially for rechargeable batteries.