The new restrictions we all sweated last season are now here with little fanfare. This is from the parque office this morning and confirmed by Zarela- unguided climbers must show membership in an UIAA-affiliated alpine club. Not a deal-breaker, but a bit of a problem without advance knowledge. Also, the parque officials have been demanding to see the original membership card, rather than photocopies, faxes, etc.- a bit of a challenge if you are using an agency for logistics.
Of course, who knows if this will last all season- but you might want to do more research before you head down here. I´m going to Llanganuco directly to plead ignorance- I doubt they will turn down my soles at the guard station..... more information when I return.