Back on mtgnews.com Megane, a member known for delivering accurate cards that are previewed on a japanese magazine, has already delivered the previews made for Fifth Dawn. So, we should consider these as pretty sure to come out on the set.
http://forums.mtgnews.com/showthread.php?t=169186&page=2&pp=15Amongst them was the following:
"SESSHUU" [Acquisition?]
3UU
Sorcery
(rare)
Search target opponent's library for an artifact card and put that card into play under your control. Then that player shuffles his or her library.
Illus. Daren bader
#21/165
I believe it will make a pretty nice fit into all Slaver decks or 7-10 since the mana cost seems irrelevant for such decks, not to mention the card has a very powerful effect!
EDIT: oops, I thought this sorcery worked like the beacons and got reshuffled back into the library... I think it's pretty interesting still... Although Memnarch probably does a better job at stealing stuff.