There are rumors that Iran has made progress on a new kind of uranium enrichment using a gas permeable membrane.
The last nuke scientist that was degraded was supposedly the author of a recently published paper on that subject and heading up the effort.
Just rumors for now, it would be like the Iranians to bray like a pack of mules whenever they can show the world their technical advancements.
Oops, I rumored too soon, just found out what Achmadi-nejad is announcing:
The formerly secret Fordo enrichment facility will become fully operational over the next few days.
They will be able to enrich to weapons grade, without limitation.
There have been a lot of speculation about bunker-buster bombs, etc. The Iranians believe this site is so hardened and self-contained that they are invulnerable and able to build nukes here.