At the moment, we're guessing, so...
1-B: Almost certainly non-trivial
1-C: Almost certainly - Generic PSP chargers are fine for the 505 & no reason that would have changed
2-B: Unknown - reports suggest that the filing system is changed from the 500/505
2-C: The actual memory sticks make a difference in terms of current draw too, it's not just MS=OK, SD=Bad /but/ will you really need to carry more than ~500 books with you at once, i.e. will you really exceed the internal memory?
innards: Strictly, no-one outside Sony's yet seen a /final/ 700, let alone got one to take apart!
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