Guys PRE-PR time is attached completely to the 4/6 years clause .. I will give a clear explanation from the Bill.
OLD CITIZENSHIP ACT:
5. (1) The Minister shall grant citizenship to any person who
(a) makes application for citizenship;
(b) is eighteen years of age or over;
(c) is a permanent resident within the meaning of subsection 2(1) of the Immigration and Refugee Protection Act, and has, within the four years immediately preceding the date of his or her application, accumulated at
least three years of residence in Canada calculated in the following manner:
(i) for every day during which the person was resident in Canada before his lawful admission to Canada for permanent residence the person shall be deemed to have accumulated
one-half of a day of residence, and
(ii) for every day during which the person was resident in Canada after his lawful admission to Canada for permanent residence the person shall be deemed to have accumulated one day of residence;
(d) has an adequate knowledge of one of the official languages of Canada;
(e) has an adequate knowledge of Canada and of the responsibilities and privileges of citizenship; and
(f) is not under a removal order and is not the subject of a declaration by the Governor in Council made pursuant to section 20.
THE NEW LAW WILL REPLACE THIS BY: (FROM BILL C-24)
3. (1) Paragraphs 5(1)(c) to (e) of the Act are replaced by the following:
3. (1) Les alinéas 5(1)c) à e) de la même loi sont remplacés par ce qui suit :
2001, ch. 27, par. 228(1)
(c) is a permanent resident within the meaning of subsection 2(1) of the Immigration and Refugee Protection Act, has, subject to the regulations, no unfulfilled conditions under that Act relating to his or her status as a permanent resident and has, since becoming a permanent resident,
(i) been physically present in Canada for at least
1,460 days during the six years immediately before the date of his or her application,
(ii) been physically present in Canada for at least 183 days during each of four calendar years that are fully or partially within the six years immediately before the date of his or her application, and
(iii) met any applicable requirement under the Income Tax Act to file a return of income in respect of four taxation years that are fully or partially within the six years immediately before the date of his or her application;
Basically the whole new section will replace the old section in the previous law 
I hope this is clear now.
Therefore, the Pre-PR time will be removed once 4/6 years clause are enforced.
