well, both the 70-300L and mk-I do extend:The front lens doesn't rotate while focusing on the 70-300. If I understand your first question, I believe it doesn't.
- is the mk-II equipped with an internal focusing maybe - so it doesn't extend with zooming (same like e.g. the 70-200/4 or f/2.8 series)?
- does the front element still rotates while focusing? that was a bane of the 70-300 mk-I version?
Joel

Ef 70-300/4-5.6 L IS USM

EF 70-300/4-5.6 IS USM mk-I
so if the mk-II doesn't, that alone would make it a very, very welcomed mod. And when coupled with a more quick AF'ing and almost silent nano-USM, quite a better IQ and MTF like this:

it certainly looks like a winner
jpr2
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street candids (non-interactive):
http://www.flickriver.com/photos/qmusaget/sets/72157609618638319/
music and dance:
http://www.flickriver.com/photos/qmusaget/sets/72157600341265280/
B&W:
http://www.flickriver.com/photos/qmusaget/sets/72157623306407882/
wildlife & macro:
http://www.flickriver.com/photos/qmusaget/sets/72157600341377106/
interactive street:
http://www.flickriver.com/photos/qmusaget/sets/72157623181919323/
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