Weeeeelllll....just from quickly reading the above posts:
1) New readers/devices that do support ePub3 can take advantage of the better rendering engines incorporated into those devices/apps.
2) It is very easy to make those devices backwards compatible so that those individuals with an ePub2 only device/app can still read it. (so there is no downside to creating it in ePub3 in the first place)
3) Oh yeah, and you can actually take advantage of those special ePub3 features if you care to.
Just my .02
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