I loved this issue! PAD has done a masterful job of bringing Pietro out of the depth he descended to in Son of M.
I haven't been able to get to the comics shop because I have two finals tomorrow, but I saw the scans on scans_daily.
"I'm freaking Quicksilver, and you can eat my freaking dust!!"
AWESOME! I mean bounce up and down in your seat Awesome.
Big thumbs up to PAD.
As to why he has his powers back, I don't think it's from the terrigen crystals because they are his speed powers, not time ones. Layla's hints also discount Wanda's involvement. So either he never lost them, or reality is quietly reasserting itself.
I mean think about it, we have a universe in which Eternity is a sentient being. Don't you think it might have taken issue with a mutant reworking it just to "get back at Daddy"?