Well since the iPhone 5s marks the first (of many in the future) to run on a 64bit ARM processor. Now, I'm not technical genius, but I would guess 64bit leaves more room for programmers to work with. So, with that, it leqds me to believe that Samsung and th e like will follow and within 6 months will have all 64bit phones. So, that begs the question, can Sonic support a 64bit and 32bit architecture simultaniously?
Well the only sure way to know is to ask him. Go to #dolphin-dev on freenode and he'll probably be there. I'm assuming ios7 will be 64bit. Dolphin will probably never be ported to ios so obviously that doesn't help us but we can hope samsung and other companies follow and google makes android a 64bit operating system. That would increase performance, although it wouldn't matter now(cpus are too slow, phones don't even have 4gb of ram yet, dolphin for android is nowhere near ready), in 2-3 years it could.
I wouldn't count on Android going 64-bit within at least the next 2 years.
Anyway, there's still room for improvement in the current jit... So unless sonicadvance1 it a wall.. I don't think he'll care about 64bit...
As far as I know, Sonic plans on leaving sometime in the near future, thus any 64-bit ARM JIT business will have to be done by someone else. The 32-bit ARM JIT will probably still see plenty of work until 64-bit inevitably becomes ubiquitous and people stop caring about 32-bit because no 32-bit phone is worth running Dolphin on, similarly to the x86-32 JIT (which I hear is being axed after 4.0).
The only reason i could see Dolphin being ported to IOS 7 is if someone got a Iphone 5s and decided to Learn Objective C.
I dunno, with how many issues Sonic's had with the shitty GLES3 drivers on current Android phones, I wouldn't be surprised to see him pick up a 5s just to see if the GLES3 drivers are usable.
Besides, he did develop for OS X and iOS before, so he probably already knows Obj-C.
I'm not buying an iPhone 5s. zodttd has expressed interest in the project, ping him to do it.