From what's on scene.org and Jeffery Lim's website I've only seen 2.14p5 available for download (which is what I use on youtube), yet in_openmpt and xmp report some of the songs I have on my harddrive as having been created with 2.15, was there really a 2.15 or am I just reading this wrong?

I have a feeling the 2.15 version number just implies it's using Jeffery Lim's alternate compression routine he introduced at one point for IT files.