This slide-out menu will have the following options: Store home, My apps, My wishlist, and Redeem. The current version of the Play Store (4.3.11) has the same options, but within the three dot menu button at the top left. This will be retained in 4.4 along with Settings and Help menu.
Google is planning to change the layout of the Play Store to the card style like the Google Now and Gmail. But it’s still under certain if this layout will be available in the new version. Play Store 4.4 can be updated at the same time as the Android 4.4 rolls out, but it need not have to wait till the Kit Kat is released.
Source: Talk ANDROID