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I think the fish means it'll be waterproof. Notice that the version of the Apple logo that is being set up around the site is also suggestive of water, or something falling into water.

No no no, it's a finger which is force touching the screen and the Siri colour waves being activated

I don't see anywhere on that poster a reference to water I'm afraid
 
so NO to OLED.. apple's choice for displays are the best in the biz.. no gimmicky cartoony exaggerations. photos and designers need a natural display. ever compared a pic with 5% 'off-white' or 'charcoal' gradients? those just - POOF - disappear on other phone's screens.
 
I totally agree, fish are soooooo feminine. Give me grumbling bearded lumberjacks. On motorbikes. With flame throwers.
If you watched the event today you'd see how they carried out the theme. I was (unpleasantly) surprised how on target I was with that observation.
 
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