The Night Spinner rules are out via the latest White Dwarf. Here's what the Eldar are getting:
Night Spinner
Twin-linked Doomweaver: 12-72" S:6 AP: - Heavy 1, Large Blast, Barrage, Rending
Place a marker next to any unit hit. Any such units count as being in difficult and dangerous terrain the next time they move for any reason. After they have competed their next movement, remove the marker.
Twin-linked Shuriken Catapult
BS:3
12/12/10 Fast, Skimmer, Tank
Standard Eldar vehicle upgrades apply.
NOT a transport.
Costs the same as a Fire Prism
Heavy Support choice
Night Spinner rules are stamped as "Official"