OK, I've known about this coming for a while, just didn't know when until this afternoon - so I stayed up late to get the download started after midnight.
Fusion is more than an updated release of Lucidworks Search. It is Solr based, but it's a re-write from top to bottom. And it's not a bare bones search API only a developer can love. Connectors? Check. Security? Check. Analytics? Check. Entity extraction? Check. All included.
But what it adds is where the real capabilities and contributions are. Machine learning? Check. Admin console? Check. Machine learning? Check. Log analytics? Check. A document pre-processing pipeline? Check. Deep signal processing (think 'automated context processing')? Check.
Even if you think these new unique capabilities are not your style, then you can buy Solr support and still get licenses for connectors, entity extraction, and a handful of other formerly 'premium' products. Want it all? License the full product at a per-node price I always thought was underpriced. I'm sure you'll be hearing alot more in the coming days and weeks, but go - download - try - and see what it does for your sites. Your developers will love it, your business owners will love it, your users will love it, and I bet even your CFO will love it.
Full disclosure: I am a former employee of Lucidworks; but I'd be just as excited even if I were not. Go download it for sure and try it on your content. But be sure to check out the 'search as killer app' video on Lucid's home page www.lucidworks.com.