-You can make Run moves in addition to shooting Shuriken weapons.
-Shuriken weapons have a rule which makes them ignore armor on a to-wound roll of a 6-- similar to rending, but it's not actually the Rending rule.
-The Wraithknight starts at about 250 points and caps around 350, and towers over even the Tau Riptide. It's 9'' tall. The Wraithknight has the ability for its weapons to become twin-linked if it hits with a scatter laser it comes equipped with, even against airborne targets. It can shoot S9 and 10 small blasts, and has a total of four weapons on it-- you have a choice of several, including a huge wraithblade and a lance weapon.
- Wraithguard are cheaper both points-wise and financially speaking, and are now S5 and T6, and have the option to be equipped with Wraithblades as per the current Codex's in place of their guns, making them a dangerous close combat unit.
- Including a Spiritseer as a HQ choice allows you to bring Wraithguard as Troops.
- Expect Guardians to supplant Dire Avengers as the staple Troops choice-- they're very points efficient and with the buff to shuriken weapons, they should expect to be in a lot of competitive armies.
-The Fire Prism has been nerfed a bit-- basically, they want to drive people back towards Aspect Warrior and Wraith-heavy armies, rather than the mechanized Eldar army literally everyone and their brother played with the exact same list. Can't really say to what extent, but the purchasing advice was to "Not load up on them."
-The Avatar is "Definitely better."
-The Iyanden supplement is not a splash release, and will be normally available. Iyanden is strictly a fluff book, and contains no game rules. The rules to play a themed Iyanden army are found completely in Codex: Eldar. This is a move to appease people who want more fluff in books as well as people who would rather just have more game content with the fluff optional. This is an experiment in seeing how this works-- if it does well, expect Games Workshop to continue with the release of "chapter-specific" fluff supplements for their Codex releases.