Just spotted this posted by one of the Nimsoft product managers under the idea (link above) within the past month:
The future of probe architecture, starting with NMS 6.5, is based off a new and extensible probe framework and topology description language. Probes available in the admin console are either natively coded to this new architecture, or are adapted to be compatible. The strategy for multiple per-language SDKs is not the future direction for Nimsoft - there will be new tools and interfaces for probe development. It's understood that many customers and developers have created many custom probes for Nimsoft via the various existing SDKs (including NSA/LUA). For existing probes, built with existing SDKs, conversion and/or compatability capablities are currently under review
Sounds a bit scary, not only for Lua. I was thinking maybe I should start coding more Perl again rather than Lua, but I guess even the Perl SDK is going away in its current form. I am a bit puzzled about what is replacing the SDKs. Hopefully it will be easy to use with scripting languages, although recent events with the snmptoolkit and snmpcollector make me nervous.