Have you played JPM's b4?
Now, someone correct me if I'm wrong....but to me and I suppose pretty much everyone, the most important thing about a guitar is it's neck.
This is what controls the heart of your playing, and for me, is always the deciding factor in buying a guitar.
I can imagine (although I must state having no experince with them at all) that the necks on the EB/MM and JPM are VERY similar.
I can't see him changing his neck shape after years with Ibanez and a guitar he was comfortable with.
Your next consideration has to be build quality, and let me assure you, EB/MM shine very brightly in this area, you will get a very well crafted instrument.
You've heard him playing it with DT and G3 (I presume) so you know it ain't too far away from his older JPM era sound (although amp settings have to be taken into consideration with this, but either way, the pup's are quality).
Pretty much an even keel with most top end guitars, except for the trem (not a quality issue, but more a functionality issue)
JP's never been a big trem user, so I don't imagine you can batter the new trem like an Edge, but if that's not your bag then no problems.
If there is no way you can test drive it before purchase then I say find someone who offers a no quibbles exchange/refund poilcy.
But I just have this gut feeling that you won't be disappointed.
All the best with your purchase.
P.S. Guitarist gave it a pretty good review, but were disappointed with the output of the pups at lower volumes, and to quash any trem worries, they said it had a "great feel"