During the broadcast of There Is No Place Like Home Parts 2 & 3, "The DHARMA Initiative" (paid for by ABC, Inc.) broadcast an advert for Octagon Global Recruiting, and the website http://www.octagonglobalrecruiting.com.
The advert asked for volunteers, and advertises the dates 24 - 27 July 2008 in San Diego, California as the date for the first drive.
This co-incides with Comic-Con 2008. It seems that this might be the new ARG, following up from The Lost Experience and Find 815. Only two months till we find out, but its very likely that this will be an ARG designed to fill in some more backstory of the DHARMA Initiative.
Here is the advert again for anyone who missed it: