Selling home in Canada after becoming Non resident

Below my situation.

1) Got 3 year TN visa earlier.
2) Bought a house in US
3) Family moved to US
4) Leased home in Canada for long term through a realtor. Have to keep bank account to pay mortgage
5) Company switched me to H visa to initiate green card process.
6) Till green card is approved, I plan to keep the my house in Canada and continue leasing it.
7) I plan to file NR-73 this year to declare as non resident canadian and also file departure tax.
I also plan to file US 1040 with 1116 showing world income including Canada rental income on US tax return for 2009.

Questions-
1) Since my family spent less than 180 days in Canada, does my wife also has to file departure return & NR-73 separately in 2009 ?
2) For 2009, what taxes, I have to pay to Canada- Only on income in Canada or total income?
3) If I sell my Canada home after becoming non resident, do I have to inform 30 days in advance to get compliance letter from CRA? How will the capital appreciation taxed on rented house in Canada owned by a non resident?

Please advise.

You correctly posted this on forums.serbinski.com. Follow up on my response there, please.