For those interested in EE 2015 / who already applied under FSW 2014: I found some answers under this notice - FAQ:
http://www.cic.gc.ca/english/department/media/notices/2014-12-01.asp
Q No7
Applications received by CIC before the launch of Express Entry will be processed according to the rules in place at that time
Q no 30. I am currently waiting for my application for permanent residence to be processed in the Federal Skilled Worker Program. Can I submit an Express Entry profile?
You may submit a new Express Entry profile, but it is not necessary. However, we will not refund any processing fees paid related to your original application. Your existing application will be processed based on the rules in place at the time you applied. If you choose to create an Express Entry profile and are invited to apply, you will be required to submit a new application for permanent residence and the associated processing fees
http://www.cic.gc.ca/english/department/media/notices/2014-12-01.asp
Q No7
Applications received by CIC before the launch of Express Entry will be processed according to the rules in place at that time
Q no 30. I am currently waiting for my application for permanent residence to be processed in the Federal Skilled Worker Program. Can I submit an Express Entry profile?
You may submit a new Express Entry profile, but it is not necessary. However, we will not refund any processing fees paid related to your original application. Your existing application will be processed based on the rules in place at the time you applied. If you choose to create an Express Entry profile and are invited to apply, you will be required to submit a new application for permanent residence and the associated processing fees