The latest one is the 4X70 prefixes, followed by a single letter, now there are supposed to be enough stations on with this event to work all the letter stations, the letters will spell Israel. Ok, so far only one, or two have been activated. You might work them all except for one key letter, that will have very limited activity. If you are so inclined to try for this award it will involve paper work and some expense, so good luck in finding them all and indeed working them. The rules are listed in this month's QST in the Special event stations listings.