Is there an Eclispe plugin for the new JME SDK, or is it only Netbeans?
There is only the netbeans plugin (JMP).
However you can do your coding in eclipse and just do the scene editing in netbeans, that’s what I do.
The two are only marginally different nowadays, I suggest simply trying jMP. I for example use an adapted version of Eclipse for JavaCard development, simply because its made for it. Also, jMP is not just a set of plugins, they would take too much control over a normal NetBeans install.