Hi, I'm a very occasional poster here, but a long-term user of EN (12 years and counting). I'm excited about backlinks, because it's a feature I have long wanted (and contributed to a feature request for).
Having had a very brief play, it seems that backlinks aren't created immediately - there appears to be a delay between creating a new link and it appearing in the backlink count. I assume that there's some asynchronous offline stuff happening in the backend.
What I'd really like to see is an ability to list out the backlinks in the note itself - that would lend itself to creating automatic "hub pages" for a particular topic. That said, any backlinks feature is better than none.