It is probably most advantageous for you to file jointly with your wife, filing Form 1040 with Form 1116 to claim the Foreign Tax Credit. Form 1116 is required because you must claim ALL world-wide income earned in 2015, and the Form 1116 allows you to claim a credit for the income taxes paid to your home country.
You will need to apply for an Individual Tax Identification Number (ITIN) for your wife by submitting Form W-7, and that process underwent some radical procedural changes in 2012. Instead of the simple notarization process, the IRS now requires that your home country certify the photocopy of your passport as a true copy. This is due to rampant fraud in the ITIN submission process. The notaries simply cannot tell the difference between a fake passport and the genuine passport.
FIRST ALTERNATIVE:
For Indian clients, this certification can be done by the Indian embassy in Washington, D.C. or at one of the consulates in San Francisco, Chicago, Houston or New York. Assuming you do NOT want to drive there, you need to call the nearest consulate and arrange to have this process done via the mail. You have time to get this done (the process, done via mail, can take up to three months to complete). My clients to date have had the best results by mail with the San Francisco consulate, getting the certified passport photocopies in less than 3 weeks.
SECOND ALTERNATIVE:
The IRS also have Tax Assistance Centers through which you may be able to have the passport verified as genuine, then submit the tax return and Form W-7 IN PERSON to be forwarded to the ITIN Processing Center in Austin, Texas for processing , without having to get the photocopies certified by your home country consulate.
You go to the TAC with your wife, her passport, the SIGNED Forms W-7, and the completed and SIGNED tax return.
The IRS official verifies the passports, asks a few questions, completes the certification paperwork, checks the Forms W-7 and tax return, then returns the passports with a receipt for the tax return and Forms W-7, which is sent to Austin, Texas for processing.
You leave the TAC with your wife, the passport and a receipt for the Forms W-7 and the tax return.
You would get the ITIN about six weeks after you left the TAC.
The tax returns are NOT processed at Austin, Texas, but rather forwarded to the regional IRS centers for processing, so the refund will come about one month AFTER you get the ITIN letters.
The list of the TACs are at the link below:
Taxpayer Assistance Center Locations Where In-Person Document Verification is Provided
The FINAL alternative is to mail in the actual passports themselves, something most of my clients are reluctant to do, because, if the IRS gets the passport, they hold it for about TWO months.
After you get the ITIN, you can then efile the state tax returns.