iRulesLX. Anyone have any information what this new feature is?

So May I ask, what the most part of consideration here, if we are running 11.6 with EHF-5, and planning to upgrade our F5 units to 12.0 (EHF-x).

1. Does existing iRules work at 12.0 ? or conversion of iRules is required from existing to (java node.js) format ? if yes then do we need separate license ?
2. default behavior any new listed features at 12.0, cause any impact ?
3. Would existing UCS file get loaded at 12.0, i meant does encrypted attributes at 11.6 be supported at 12.0 for decrypted ?
4. We are keeping almost 28 viprion chassis (2100/2200 almost) with 2 blades in each, what do we need to consider from hardware standpoint before upgrade if any TMM process or shared memory need more resources ?

Kindly Advise Jai A Singla