Yes. They said that they didn't release the source for Honeycomb because there was no support for smaller devices because they were "cutting corners". I closed the tab a few minutes ago otherwise I'd have the link for you.

Found the link: http://thisismynext.com/2011/10/18/exclusive-matias-duarte-i...

This is the exact quote: “On Honeycomb we cheated, we cut the corner of all that smaller device support. That’s the sole reason we haven’t open sourced it.”