Batman 21 Lenticular cover

So I've just read Batman 21 and although it didn't offer many answers for the nature of Rebirth I think the next couple of issues are going to be very interesting. I have to mention the Batman 21 Lenticular cover which isn't meant to be available internationally (why!!! ) however if you move fast you can pick them up for around £10 on the bay, I think these will be rare in the uk they are not officially released till the 20th April 2017 but they could be the start of a key set of books for the DC universe.