The beta runs fine on iPhone 4/4S. Set it up as a new phone and do not restore any backup and you will have no battery issues. Most of he animations and transparencies are missing on the 4 but no surprise there to be honest.
For a first beta it runs super slick and fast on my iPhone 5. It was a bit jarring at first but after using it for a day I really love it. Going to see how we'll it runs on 4/4S at the weekend.
Looks MUCH better on my white 5 than on my black one though.
Can't wait. Now that I'm approaching 40, married with 2 kids its just another opportunity to spoil them with new gaming tech and at the same time let me get my hands on it too.
Too old for games!?! GTFO