I didn't find anything concrete. You can look at
http://www.cic.gc.ca/English/resources/manuals/ip/ip02-eng.pdf yourself. Only in section 5.36 on page 23 does it say that they should use the new LICO which could mean that they will not use the new LICO if they are re-assessing you for other reasons than listed in 5.36.
In 5.34 it says that income can only be re-assessed downward, not upward so that could be another reason why they would keep using the old LICO. It would not be fair to you if you meet the LICO when you apply and meet the new LICO when you are re-assessed that you would still be refused because your re-assessment can not be upwards. Then again, immigration sometimes applies rules that are not exactly fair.