diff --git a/CHANGELOG.md b/CHANGELOG.md
index e363e6b..c8affa8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## v3.0.0-RC2 / 2013-12-04
+## v3.0.0-RC4 / 2013-Jan-02
 
 Major update, non-breaking though users with custom appenders are encouraged to view the _Changes_ section below. This version polishes up the codebase and general design. Tightened up a few aspects of how appenders and appender middleware work. Added a serializing Carmine appender (I use something similar in prod most of the time). Also finally added facilities for ad hoc (non-atom) logging configuration.
 
@@ -6,6 +6,7 @@ Overall quite happy with the state of Timbre as of this release. No major antici
 
 ### Features
  * Android appender, courtesy of AdamClements.
+ * Rolling appender, courtesy of megayu.
  * Powerful, high-performance Carmine (Redis) appender: query-able, rotating serialized log entries by log level. See README or appender's docstring for details. (Recommended!)
  * Appender rate limits now specified in a more flexible format: `[ncalls window-msecs]`, e.g. `[1 2000]` for 1 write / 2000 msecs.
  * Appender rate limits now also apply (at 1/4 ncalls) to any _particular_ logging arguments in the same time window. This helps prevent a particular logging call from flooding the limiter and preventing other calls from getting through.
diff --git a/README.md b/README.md
index 99af9aa..e57ab27 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 **[API docs](http://ptaoussanis.github.io/timbre/)** | **[CHANGELOG](https://github.com/ptaoussanis/timbre/blob/master/CHANGELOG.md)** | [contact & contributing](#contact--contribution) | [other Clojure libs](https://www.taoensso.com/clojure-libraries) | [Twitter](https://twitter.com/#!/ptaoussanis) | current [semantic](http://semver.org/) version:
 
 ```clojure
-[com.taoensso/timbre "3.0.0-RC3"] ; Non-breaking upgrade - see CHANGELOG for details
+[com.taoensso/timbre "3.0.0-RC4"] ; Non-breaking upgrade - see CHANGELOG for details
 [com.taoensso/timbre "2.7.1"] ; Stable
 ```
 
@@ -31,7 +31,7 @@ Logging with Java can be maddeningly, unnecessarily hard. Particularly if all yo
 Add the necessary dependency to your [Leiningen](http://leiningen.org/) `project.clj` and use the supplied ns-import helper:
 
 ```clojure
-[com.taoensso/timbre "3.0.0-RC3"] ; project.clj
+[com.taoensso/timbre "3.0.0-RC4"] ; project.clj
 
 (ns my-app (:require [taoensso.timbre :as timbre])) ; Your ns
 (timbre/refer-timbre) ; Provides useful Timbre aliases in this ns
diff --git a/project.clj b/project.clj
index 68bb715..6f733db 100644
--- a/project.clj
+++ b/project.clj
@@ -1,11 +1,11 @@
-(defproject com.taoensso/timbre "3.0.0-RC3"
+(defproject com.taoensso/timbre "3.0.0-RC4"
   :description "Clojure logging & profiling library"
   :url "https://github.com/ptaoussanis/timbre"
   :license {:name "Eclipse Public License"
             :url  "http://www.eclipse.org/legal/epl-v10.html"}
   :dependencies [[org.clojure/clojure     "1.4.0"]
                  [org.clojure/tools.macro "0.1.5"]
-                 [io.aviso/pretty         "0.1.6"]]
+                 [io.aviso/pretty         "0.1.8"]]
   :profiles {:1.4  {:dependencies [[org.clojure/clojure "1.4.0"]]}
              :1.5  {:dependencies [[org.clojure/clojure "1.5.1"]]}
              :1.6  {:dependencies [[org.clojure/clojure "1.6.0-alpha2"]]}
@@ -19,7 +19,7 @@
             "start-dev" ["with-profile" "+dev,+test,+bench" "repl" ":headless"]
             "codox"     ["with-profile" "+dev,+test" "doc"]}
   :plugins [[lein-expectations "0.0.8"]
-            [lein-autoexpect   "1.0"]
+            [lein-autoexpect   "1.2.1"]
             [lein-ancient      "0.5.4"]
             [codox             "0.6.6"]]
   :min-lein-version "2.0.0"
diff --git a/src/taoensso/timbre.clj b/src/taoensso/timbre.clj
index 0db7b42..252457b 100644
--- a/src/taoensso/timbre.clj
+++ b/src/taoensso/timbre.clj
@@ -291,8 +291,7 @@
                                     (assoc  :message
                                       (when-not (empty? args)
                                         (case msg-type
-                                          :format    (if-not (next args) (str args)
-                                                       (apply format args))
+                                          :format    (apply format    args)
                                           :print-str (apply print-str args)
                                           :nil       nil)))))
                   juxtfn-args (assoc juxtfn-args :timestamp (timestamp-fn instant))
diff --git a/src/taoensso/timbre/profiling.clj b/src/taoensso/timbre/profiling.clj
index 0f3969d..8be9515 100644
--- a/src/taoensso/timbre/profiling.clj
+++ b/src/taoensso/timbre/profiling.clj
@@ -105,7 +105,7 @@
               (perc accounted clock-time) (ft accounted)))))
 
 (defmacro defnp "Like `defn` but wraps body in `p` macro."
-  {:arglists '([name doc-string? attr-map? [params] prepost-map? body])}
+  {:arglists '([name ?doc-string ?attr-map [params] ?prepost-map body])}
   [name & sigs]
   (let [[name [params & sigs]] (macro/name-with-attributes name sigs)
         prepost-map (when (and (map? (first sigs)) (next sigs)) (first sigs))