Neowin published a video of the new Start Menu that will make its introduction in a future update to Windows 8.1. Microsoft is still working on this feature so it's possible that the final version may look a bit different. It's unknown when Microsoft plans to reintroduce the Start Menu but we expect it will be in the coming months.
For starters, adding live tiles to the menu can be accomplished by dragging a modern app from the list on the left in to the ‘modern’ area. The ‘modern’ area of the Start menu is also adjustable in terms of how wide it is, as you can clearly see in the video.
You will also be able to adjust the live tile sizes and layouts in the Start menu as well, which will provide you another location to create your perfect application layout.
Finally, the vertical height of the Start menu can be adjusted too. As shown in the video, when the modern apps were added to the first column, it grew in height.