Wouldn't usually double post, but wanted to make sure people saw that a solution had been posted.
Thanks to the folks in the Minecraft Forge IRC channel, namely TehBeard, I figured out that this was caused due to being unable to run javac from the command line.
Now, I'm not sure if this was a recent change with 1.6.2, but for whatever reason I had no issues with 1.5.2. So for those who run into the issue, make sure all of this is true:
1. You have the most up to date JRE and JDK
2. You have the proper versions for your processor (ie. x86 or x64)
3. Ensure you can run java and javac from the command line
4. If not, add them to your environment PATH variables. Searching environment variable in the windows search at the control panel will make this easy.
P.S. A new fun fact I learned, is double check that your development environment (in my case, a custom Eclipse workspace) has the proper libraries in the build path. Provided you aren't using scala, they are:
1.6.2.jar
argo-2.25_fixed.jar
asm-all-4.1.jar
bcprov-jdk15on-1.47.jar
codecjorbis-20101023.jar
codecwav-20101023.jar
commons-io-2.4.jar
commons-lang3-3.1.jar
gson-2.2.2.jar
guava-14.0.jar
jinput-2.0.5.jar*
jopt-simple-4.5.jar
jutils-1.0.0.jar
launchwrapper-1.3.jar
libraryjavasound-20101123.jar
libraryjwjglopenal-20100824.jar
lwjgl_util-2.9.0.jar*
lwjgl-2.9.0.jar*
Izma-0.0.1.jar
soundsystem-20120107.jar
All of these should also be exported, with the exception of "1.6.2.jar." As well as this, all the ones marked with a astrik (*) should have the native library location set to:
mcp/jars/versions/1.6.2/1.6.2-natives
Finally, ensure that you have the run configuration pointing to the working directory that contains the assets folder (in this case mcp/jars). I was getting quite a headache with an error resulting in not having the proper icon for Minecraft after launching.
I hope this helps anyone else with this issue.