GMAT exam has one new section starting from June 2012 - Integrated Reasoning (IR). You can find the details of question format here on the official exam page.
The links below will take you to sites where you can find some free practice materials.
1. Practice questions for table analysis and graphics interpretation at www.veritasprep.com.
2. Practice tests for multi-source reasoning, graphics interpretation, table analysis and two-part analysis at majortests.com.
3. Practice questions for graphics interpretation questions, two–part analysis questions, table analysis questions, multi-source reasoning questions at www.gogmat.com.