Since vNext binding and templating is done differently (cleaner), it should be much easier to implement virtual-repeat in a robust manner. I’m very much looking forward to implementing it once we get to that point, so you can expect something nice when it’s done 
In the mean time by all means feel free (it would even be appreciated) to open an RFC issue in the vNext repo to describe how you would be using it, what you need it to be capable of, etc.
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