Check out Episode 3- Eldar 2000 pts here (with links to episode 1 & 2 in it) to see the changes made.
HQ
No changes
Elites
No Changes
Troops
+Dire Avengers (10)
Exarch
Power Weapon
Shimmershield
Defend
Bladestorm
Wave Serpent
Twin Linked Scatter Lasers
+Guardians (12)
Starcannon
Wave Serpent
Twin-Linked Shuriken Cannon
Fast Attack
No Changes
Heavy Support
No Changes
Pts: 2500 Scoring Units: 4 KPs: 15, 22 (Hardboyz)
Hobby notes: Nothing different from previous lists
Evolution: Addition of Scoring units. Critical in larger battles to weather the firepower/numbers your opponent will have. Addition of standard infantry to the list. Typically this happens earlier in armies and tends to be a building block, but this list was intended to be outside the box.
Tactics: Everything operates the same as before but for the new editions to the list.
The Guardians are solely for taking and sitting on an objective and providing what fire support that they can with the star cannon which is good against small heavy infantry units, such as terminators. The wave serpent takes them where they need to go and lends to their anti-infantry fire or departs to go give anti-infantry cover to squads that may need it more, such as the firedragons or even the Jetbikes.
The Dire Advengers are for storming and taking objectives. The wavesperpent allows them to advance with the rest of your army. The bladestorm is critical for this, as they stroll up, unleash 27 S4 AP 5 shots and then assault for 18 Attacks at WS 4 I 5 and 3 WS 5 I 6 Power weapon attacks, with a 5+ invulnerable save on the squad in addition. This is perfect for hitting power weapon totting soft targets, such as Guard command squads, Sister Repentia etc. etc. Plus the squad has decent armour saves already.