В середине 2015 года в силу вступает новый закон о гражданстве- Bill C-24.
The current residency requirements require you to be:

Living in Canada for 3 out of 4 years (1,095 days) for citizenship eligibility;
No requirement that you be physically present.
In addition, you:

Can count time spent as a non-permanent resident (non-PR) toward residence for citizenship;
Do not need to prove that you “intend to reside” in Canada.

The new residency requirements require you to be:

Living in Canada for 4 years (1,460 days) out of 6 years for citizenship eligibility;
Physically present in Canada for 183 days (minimum) per year in 4 out of 6 years.
In addition, you:

Cannot count time spent as a non-permanent resident (non-PR) toward residence for citizenship;
Must prove that you “intend to reside” in Canada.