Not really sure when there will be another beta, last time I worked on Jnes was looking at removing an old MMC1 hack I had... but one of my states got corrupted, so I had to stop working on it till I had more time
I'm currently working on a commercial software product which is scheduled for release sometime this year, so emulation unfortunately doesn't get much of my time, I still consider Jnes an active project, so maybe when everything comes together with my new project I can release a beta 3 ... (eg, I need to redesign my website

)