One dev already had JB booting on a Rez and it seems that once Chad n the others over at XDA work out the kinks with AOSP I'm sure they re gonna try and start merging it with the JB framework, having a One X leak or something would probably help, then again..my coding understanding for Android is very limited. Regardless, I'm pretty sure we'll see something in the near future. It's already amazing how smooth they were able to make AOSP, CM9 and AOKP in such a relatively short amount of time.
Along with that though, I know many of us are waiting eagerly for Joelz to release an update to ViperROM with Sense 4.1..believe the Desire version was already released so the Rez should not be far off