hmmm that wasn't quite the right description of La Nina for North America.
Yes. There is a return of La Nina for the 2011-2012 winter season. This La Nina will not be as strong as last years, but will still be a good one.
For the Pacific Northwest (Northern Cali to British Columbia), this means that there will be higher than average snowfall along with cooler temperatures. Higher than average snowfall takes place because the jet stream shfits north due to an area of high pressure in the Pacific - this movement of the jet stream causes storms to make landfall right in the PNW.
For the east coast, saying an "unseasonably short, dry, and warm winter" is quite inaccurate. In fact, La Nina does not deviate temperatures in the Northeast from the average, nor is there a strong trend concerning preciptation totals. This year, the NOAA even predicts that precipitation will be slightly higher than normal in some areas.
Check out the NOAA winter outlook:
Hope this clears some things up.
Pray for snow on the east coast!