If married before December 31, then you can file as married. Likewise if a child is born before December 31 you can clam the child.
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Whether your name and/or address changes are determined by your State's laws. For example, in Louisiana, unless a person goes through the process of legally changing their name, marriage does neither requires nor causes a change of name. Rather, either spouse has the legal right to USE the other's surname. Therefore, name changes really should not affect your filing status.
Your filing status, since you were married as of December 31, 2012 will be either Married Filing Jointly (MFJ) or Married Filing Separately (MFS). MFJ has many advantages over MFS, which should only be used in certain situations.
Most likely, you will file MFJ.
Congratulations on your marriage.
This answer does not establish an attorney-client relationship, Moreover, this attorney is Licensed to practiced law ONLY in LOUISIANA and answers to questions from other jurisdictions or states are meant to provide only general information. Users should contact a local attorney in their jurisdiction or state.
If you're married before the end of the year you file either Married, filing Jointly or Married, filing separately.
Evan A. Nielsen is licensed to practice law in California and handles federal tax matters throughout the U.S. The information provided here is for educational purposes only and is not intended as legal advice for a particular matter. This response does not create any attorney-client relationship with the author. For specific advice about your particular situation, please consult an attorney.