Even the author of IMBnes posted a few lines after 2 months of silence:

All of the key changes for the next version of imbNES are now complete. I’m currently addressing some minor bugs that have crept into the code over the course of that last 6 or 7 months since the 1.2 beta release. The next version will be 1.3 (as opposed to 1.2 final) to avoid confusion and to reflect the major changes the emulator has undergone since last July. Time permitting, imbNES v1.3 will be released within a month.