I went through this a few years back.
It all depends on your situation, but basically here is what I got.
If you have any interests in Canada, ie house/car etc then you will not be considered a NON-Resident and will have to pay tax.
If you leave your wife there and the property is on her name, you will pay tax. Only way out of this is get divorced, but then that creates more problems that it will solve.
If you keep a rental propery, you pay tax.
I had to dispose of everything, basically you can keep bank accounts, mutual funds, credit cards , pensions etc. otherwise if you get audited, you will most likely get nailed with a huge tax bill.
You can spend hours reading on the CCRA web,or just call and pay an accountant for info, I would also suggest you get a professional to do your last tax filing in Canada, and have him make the CCRA application for NoN Resident, it seems to go a lot smoother that way.
Oh and you can call CCRA from here "Collect" they will accept the charges, ive done it a few times, and ask them directly if you are now considered a NON RESIDENT, it will show in there data bases.
Good luck,