Groovy++? Ok, so where's the beef?

Update: You can find the sources at http://code.google.com/p/groovypptest/downloads/list

If you're a software professional who uses Groovy, you or your colleagues greatest concern about it is likely to be performance. Groovy++, while having a horrible name, provides a jar which apparently provides some mag-i-cal Groovy performance gains. According to its authors', this new 'Groovy-ness' will be released under the Apache Public License. Terrific! Wonderful! Hurray!

So where's the fracking code?

I can understand a need for control. I can understand the author's desire to turn this into something significant for themselves financially. A man's got to eat. But until the code is open and can be inspected by some experts, I remain skeptical of Groovy++. I am hopeful however that performance improvements can be made given enough manpower and talent. Too bad we all have day jobs ;)