Hokkaido Shinkansen will be opened on March 26, 2016 between Shin-Aomori and Shin-Hakodate-Hokuto. This will be the newest Shinkansen (Bullet Train) line technically. However this line is connected with Tohoku Shinkansen at Shin-Aomori. Many of trains run through Tohoku Shinkansen to Shin-Hakodate-Hokuto from Tokyo. You will be able to get Hokkaido from Tokyo directly by this Shinkansen train.
However Hokkaido Shinkansen will be partial open. You can get southern Hokkaido only. You still need to transfer to get most of Hokkaido. such as Sapporo. And also Shin-Hakodate-Hokuto station is not located in downtown of Hakodate. You need to transfer to get Hakodate.
I mentioned many negative things at the beginning. But it will be much more convenient and faster than current trains. There are a few things that you need to know before taking Hokkaido Shinkansen. I would like to show you the detail of Hokkaido Shinkansen and will also give you some tips to use this Shinkansen line in this post.
JR Group has announced that Hokkaido Shinkansen is fully covered by Japan Rail Pass, a.k.a. JR pass.