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There have been weekly betas going on for quite a while, with some exceptions. So it could very well be today. As we mostly say here it's pretty polished already so it could be weekly minor bug fixes and no new features.
 
Hey guys ... .. I am back .
So I installed iOS 10.3 beta 1 on my iPad Air 2 and iPhone SE

I haven't had any orientation lock issues on my iPad Air 2 since this update.
Very happy ...

iPhone SE: very fast , very smooth, also , I love the new iCloud profile that is on the top of all settings . Seems very useful....
iOS 10.3 beta 2 release this week ???
 
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