Also note that Ctrl + Tab works to cycle through tabs.
It seems to be implemented as a stack of MRU-LRU tabs, which means that pressing Ctrl + Tab once will bring you to the last previous tab used, and pressing Ctrl + Tab will return you back to where you were.
A pop-up window will appear in which the available tabs are displayed while holding Ctrl, which allows you to select a tab from the list.
It basically looks like a classic MDI window tab.
I do not think this is part of VsVim, but rather a transition to Visual Studio.
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