Some very good news! (assuming you like free stuff)
I had earlier discussed hopes of possibly converting the CSUAC to MapForge's Add-On format. However, I recently re-read the CSUAC’s EULA (End User License Agreement), and I found this:
Notwithstanding anything to the contrary contained herein, you are not permitted under any circumstances:
(d) to use the CSUAC Art Collection or the images within the art pack to create a database or as material for a mapping program or application except for your own private use.
So my grand plan would apparently be a big no-no.
But before giving up all hope, I decided to contact Cecil Solomon about it (he's the creator of the CSUAC, which for those who don't know stands for "Cecil Solomon's Unified Art Collection"), and managed to secure special permission from him to do exactly that. This is huge, folks!
When the Crucible utility is released (around October?), volunteers will be able to each take a thematically-logical piece of the CSUAC and port it to an Add-On, which would be shared with the entire MapForge community and userbase. This means potentially dozens of free Add-Ons for everyone! All legal, square, and legit!
As an added side-benefit of all this, it seems that MapForge has reawakened Cecil's desire to produce new mapping art, so we should expect to see something from him sometime later this year.