Can a descriptive link to the ELL proposal be added to one or more of the following?
- The FAQ
- The General Reference description
- A block in the sidebar or, if not, then as a sticky link in the "Community Bulletin" block.
I'm adding this answer because kiamlaluno's It's quite too early to add any link to ELL is out-of-date. I think we should now have a line in the What kind of questions can I ask here? section of the ELU FAQ saying something along the lines of...
Please consider whether your question might be better asked on English Language Learners.
It's quite too early to add any link to ELL, as it is just a proposal, which is still in commitment phase. Once the proposal became a site, and graduated, adding a reference to ELL can be considered.
As for the suggestions:
The FAQ contains a part that can be edited from moderators, and which can eventually suggest other Stack Exchange sites that could be interesting for the users who normally ask questions on EL&U, and which are pertinent. (This means the FAQ would not suggest Stack Overflow as alternative site where to ask questions.)
The description for the closing reasons are the same for every Stack Exchange sites (except Area 51, and StackApps). It is rather difficult Stack Exchange implements customized descriptions for each site, at least for the fact it would confuse users who has an account on other Stack Exchange sites.
The Community Bulletin block can have a link to a meta question that has been tagged featured, but that tag is automatically removed after X days (I think it should be 30 days).