I don't know when it started, but Transgaming has been using LGPL chunks of Wine for quite some time.
As they're required to, they've released the source for these files, along with whatever changes they've made. However, they're not required to tell us what they did, to send us patches, or to even let us know they've made a change.
What this means is that it's possible, even likely, that Transgaming has improved the LGPL parts of Cedega in some important way that would be useful to Wine as well, without us having even known about it.
The simplest thing to do is for someone to just track the code they release and diff it against our own stuff, and note if anything new and interesting (eg an implementation of a function) comes up. Then send in a patch if it seems like it could help us too. But, is anyone doing this?
Thanks, Scott Ritchie