Everything should transfer over to Lightroom 5. But Lightroom 5 will default to a newer process version that may not recognize some of your presets. This won't have any impact on your existing photos, but you may have to switch new imports back to process 2010 in order to utilize presets. It isn't a big deal, and you can make process 2010 the default for imports if you want. But process 2012 was a big improvement, in my opinion.