Blogger are now starting the migration process, so that you may transfer your current account and blogs over to the Beta Blogger. They have decided to let people migrate in an incremental way, so as not to create a massive mad rush. If you are one of them, you will see a blue box in the sidebar of your Dashboard. The only down side to the migration would be that you have to convert your Blogger account into a Google account, or log into your current Google account and have that one converted.
Hopefully they will make it so that you can login with both your Google account and your Blogger account, to make it easier. For now, once you have switched, you must log into beta.blogger.com instead of blogger.com to access the new features.