hey man,
1) I dont think you will get a new work permit based on a new job offer letter, you need LMIA and based on that you can get a closed work permit, and ofcourse you know getting LMIA is not easy
2)only if you have canadian visa then you can enter back if you screw up at the border
3)If the border realize you dont have work right now then they might not let you in even with your closed work permit and visa as what would be your purpose in canada if you cant work anywhere else cuz of the work permit limitations.
4) so yea best would be just to give a few months, in my case there is no guarantee of my job in this *censored word* economy, im dead anyways if i loose my job then why not just risk not telling and wait for PR process to complete with a few damn months left..?, CIC will definitely not care or ask about your job, its like the old CEC system -1 year exp, apply PR, done.
PNP on the other hand have thousands of application, they are ridiculously tied up and are not gonna call and inquire, they cant even give out the nominations on time with all the back log so how do you think they are gonna actually be caring if you still have job, their part is done already, so you have to absolutely not worry about them.
MY PR file no. based on PNP came on Aug 27th, and yea we should be getting our medical anytime now acc. to what i see on this thread.
Just cross your legs