Square Enix has offered 84.3 million pounds ($120 million USD / €93.5 million EUR) to acquire Eidos. The offer has been accepted by the board, but not yet by the stockholders.
Eidos is responsible for the Tomb Raider series, which has been successfull in the part. Only the sales of the last game of the series, Tomb Raider: Underworld, were much worser than expected.
If you're wondering what Eidos has to do with Square: in the past they released the PC version of Final Fantasy VII and Final Fantasy VIII.
The takeover fits in a recently released strategy to aim more to the West.