Ristocrat (pronounced "arristocrat") will be a better, richer REPL for R, that
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Easier editing of R commands and history using ed-like history traversal and an editor of your choice (like vim).
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Color-coded console input and output, which should allow for clearer and faster inspection of code.
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Smart pasting capabilities, preventing R expressions such as
if (blah) 1 else 2
from causing errors due to sequential line interpretation.
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Integration with a background Docker service that is much smarter about maintaining an in-memory cache of your data than RData files, and will allow for (probably immutable read-only) shared memory between Ristrocrat sessions.