Thanks to the anonymous commenter who posted this:
I just called Akai US and they told me not till June. I pre ordered on Amazon and hope it comes much sooner!
This doesn’t bode well for the iPK25 in the UK. Even if it does make it to the US sometime in June then I can’t see it coming to the UK until late July, and even then there’s still the issue of the voucher code in the UK.