A macro that wraps values in a binding form with `future` and transparently `deref` them in the body.

let_futures.clj

(defmacro let-futures
  [bindings & body]
  (let [binding-pairs (partition 2 bindings)
        future-syms (set (map first binding-pairs))
        binding-vector (vec (mapcat (fn [[l r]] [l (list 'future r)]) binding-pairs))
        body-code (clojure.walk/walk
                   (fn derefify [x]
                     (if (future-syms x)
                       (list 'clojure.core/deref x)
                       (clojure.walk/walk derefify identity x)))
                   identity
                   body)]
    `(let ~binding-vector ~@body-code)))