From what has been released till date, people with LMO-approved skilled job offer will be almost guaranteed to get an invitation to apply for the PR through one of the PR categories. The expectation is that if all your supporting documents are correct and satisfies the requirements of the program you apply through (not sure if these will change or remain the same), PR will be issued within 6 months after invitation. Here's an excerpt from the below link:
"Candidates will be ranked against others in the pool. Only the highest-ranked candidates (those deemed to have the best chances for economic success), and those with qualifying offers of arranged employment or provincial/territorial nominations, will be invited to apply for permanent residence."
http://www.cic.gc.ca/english/immigrate/express/express-entry.asp?utm_source=slash-express&utm_medium=short-url&utm_campaign=express-entry