Aplying for Temporary visa when in process for Permanent residence visa??

I had apply from Mexico for Permanent residence visa,my wife and kids (all canadian citizen) already had move to Canada last August 2011,they received my application on the CIC on 9 August 2011, today they received polices certificates,medical,sponsor and all!,the time has been very long especially for the kids that don't really understand why that long...I'm thinking on applying for temporary tourist visa in order to go and visit them in this February...

Does anybody knows if there is any problem with this?, will that be inconvenient for my permanent application?,do I have a possibility to have the permanent before the end of February?, will that action slow my prices for PRV?

Please any advice will be very appreciate...