What carrire are you with, I got mine from Sprint and it came with 4.2.2 out of the box. I havent noticed a flicker in the screen yet. There is not a whole lot of Dev for it, I don't do a whole lot of posting but I have been a little moved to try and port Miui over to it.
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HTC Harrier-> HTC Apache-> HTC Mogul-> HTC Diamond-> HTC Touch Pro2-> HTC Hero-> HTC Supersonic-> HTC Shooter-> Samsung Galaxy Note 2
Asus Transformer TF101 - Android Revolution HD 3.2.0
Asus Transformer TF300T
Google Nexus 7
Samsung Galaxy Note 10.1
Sprint Samsung Galaxy Tab 3 7.0