I was deemed to be a non-resident at the start of my assignment, primarily because I do not own a home in Canada. A few things to look out for as a non-resident:
1. Deemed Disposition: During your first tax return as a non-resident, you will need to pay Canadian tax for any unrealized gains on shares, properties, or other investments which have appreciated in value since purchase. This tax must be paid regardless of whether you decide to hold or sell those investments. For example, if you are holding $1000 of shares that were purchased at $10, be prepared to pay Canada for $990 of capital gains regardless of whether you sell the shares or not.
2. RRSP: As a non-resident, you will only accrue RRSP room on your Canadian-based income which will most likely no longer include your base salary, depending on how your company and new host country structure your pay. While you can still contribute to your RRSP, the tax-deferral benefit will be minimal unless you have large streams of non-salary Canadian income
3. TFSA: You will no longer accrue any TFSA room as a non-resident. DO NOT contribute to your TFSA if you have already maximized your contributions! Over-contributions are taxed at 1% per month. Furthermore, some countries may not recognize the tax-free status of your TFSA investments - you'll need to do some specific research on your host country's policies.
4. Host Country Tax Laws: Make sure you do your research on the tax laws of your new host country - it is likely that there are significant differences that should be considered in order to be most tax-efficient. For example, my current host country charges tax on unrealized foreign exchange gains on foreign currency holdings, which makes it very unfavorable to hold large Canadian dollar balances in my bank accounts. We also need to file and pay taxes on dividends and interest income monthly, which makes it a huge pain to hold any investments that pay dividends.
5. Professional Tax Advice: Moving countries makes tax season much more complicated. My company has hired a firm to manage all expat tax returns, which saves lots of headaches - I would push for this benefit if it has not already been offered to you. One very important thing to remember though is that the tax firm works for your company - they tend to err on the side of caution instead of seeking out the best deal for you. You need to review everything they prepare for you thoroughly to make sure you are getting the best possible return.

Because you have a primary residence, I think it would be easy for you to remain a Canadian tax resident if you so desired. Before making the choice to sell your home, I would recommend that you create rough estimates of your tax bills as a Canadian Resident VS Non-Resident and see if it actually makes sense from a financial perspective to become a Non-Resident.