This is a great improvement in AutoCAD 2013. Located in the new panel called “Model Viewports” on the View tab of the ribbon is the normal dropdown list but the improvement is that now you have a preview of how the viewports will be arranged.
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The New panel called : “Model Viewports” is great because it makes it clear that the viewport tools located in this panel apply to model space.
AutoCAD Tips 
i think is a good feature, but what happen to the button to actually create a new viewport on a layout? the only way that I am able to do it now as use the VIEWPORTS command or enable the menu bar and then go to view -> viewports -> new viewports…
both of these ways prompt me to popup, where i have options. I just dont know what happened to the simpler way to create a normal, viewport of the model space w/o asking me anything.
I have made a post that hopefully helps you with your paper space needs. The simplest way to create a new viewport that I know of is using the command MV and then pick 2 points to make the viewport.
https://autocadtips.wordpress.com/2012/04/01/autocad-2013-paper-space-viewports/
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Hi i have found the solution.
They have moved the viewport tool to the new layout Tab.
Regards
Hendrik de Villiers
Modena Design Centre Durban ZA
I have autocad 2013 pls help me my layout is having a problem with grid inside the layout
Double click inside of the viewport to activate it and then turn off the grid from the status bar or by entering GRIDMODE in the command line and set it to 0 (zero)
http://docs.autodesk.com/ACD/2010/ENU/AutoCAD%202010%20User%20Documentation/index.html?url=WS1a9193826455f5ffa23ce210c4a30acaf-4fcd.htm,topicNumber=d0e347682
~Greg