The big stories are these. Having become
a lot more Republican: North Dakota, Wyoming, Kansas, Oklahoma and Montana. Having become more Democratic, that is relatively speaking: California, New York, New Mexico and New Jersey. That basically means that none of these states will be anywhere near battleground status come 2016.
Some states (we only have the numbers for 24 states + D.C. right now) shifts over this 6 year period.
Very Democratic states:
Washington D.C.: -17.4
Vermont: -13.7
Rhode Island: -13.5
Massachusetts: -13
Connecticut: -10.3
Hawaii: -9.8
Illinois: -7.2
Maryland: -6.3
Delaware: -6.2
New Jersey: -3.1
New Mexico: -2.8
New York: -2
California: -1.4
Very Republican states:
North Dakota: +25.7 (!)
Wyoming: +19.9
Kansas: +19
Oklahoma: +18.7
Montana: +16.9
Alabama: +10.2
South Carolina: +10.1
Alaska: +9.4
Nebraska: +9.4
Utah: +9.3
Idaho: +8.7
The remaining 26 states are either regarded as toss ups (within 5% partisan advantage) or only "slighly" leaning one way or the other (up to 9% partisan advantage).
The released Gallup numbers so far:
http://www.gallup.com/poll/167030/not-states-lean-democratic-2013.aspx?ref=image