So it wasn't an April Fools joke. Clocking in @ $127, this flyer can be used in Codex Marines, DA, SW, BT, AND Chaos Marines.
The codex SM, DA, SW, BT version of the flyer clocks in at 25 points more than a Stock BA Raven. the front bolter can be replaced like the Raven, but the wing mounted weapons have to be bought. the options are 4 HellStrikes, or 2 TL-Lascans and is a Fast slot option. Finally the Vengeance Launcher is a 48", 5,4 H2, LB. The flyer has a transport capacity of 20 troops (10 jump or terms.)
Unlike the Raven (which is built to be a gun ship first, transport second,) the Eagle is much more of a transport that has a decent anti troop armament. The Ravens downside (point cost) is the same issue with the Eagle.
The CSM version is 5 points more than the Stock SR, but can not replace the TL-HB with a typhoon ML, and doesn't have PotMS. The TL-HB can be replaced with a Reaper Autocannon, and Daemonic possession can be bought for 5 points more than Codex Marines Extra Armor. As with the loyalist bird, it is a Fast slot option.
http://www.forgeworld.co.uk/Warhammer-40000/Space_Marines/Space_Marine_Aircraft/STORM_EAGLE.html
http://www.forgeworld.co.uk/Downloads/Product/PDF/s/Stormeagle.pdf