Forge World have released a revised update for Imperial Armour Volume 2. This new version 1.1 PDF contains a few changes, notably the GK Land Raider is now able to take the psycannon upgrade to replace the heavy bolters and a fix to the GK Dreadnought incinerator option.

Find it here
http://www.forgeworld.co.uk/downloads40k.htm
(cheers for the heads Up spack )

Doh, I hit paste and then submit and thought I'd included the link

A few changes.
The inquisitorial chimera is now a command vehicle, not a "mobile firebase".

Interestingly, GK LRCs still can't - according to FW - take a multmelta, even though it IS a codex option for them.

The changes I noted:
P3: (Space Marines vehicles). Add Twin-linked Multi-melta to list of Razorback weapon upgrades (free).
p4: Land Raider Helios. Wargear reads "Twin linked lascannons" changed to "TWO sponsons each with Twin-linked lascannons"
p11: Inquisition Chimera. Armoured firebase under special Rules is deleted.
p12: Grey Knight Land Raider: May exchange twin-linked LASCANNONS for twin-linked Psycannons for free changed to "... Heavy Bolters to Twin-linked Psycannons (additional cost)
Grey Knight Land Raider Crusader.
Wargear lists: Two Hurricane bolters, TWO twin linked assault cannons. (Sloppy copy/paste error)
Changed to "... Twin linked assault cannons".
p13 Grey Knight Dreadnoughts. Weapon upgrades. "Replace storm bolter with Heavy flamer" becomes "replace ... with incinerator" and "incinerator" removed from "upgrade multi-melta with" list. (GK dreads do NOT have a heavy flamer option.)
Note also that under FW/IA, GK Crusaders DO NOT have a multimelta option. Codex: DH they do.

These were picked up by the Adobe Compare two documents function.

It's interesting that they didn't change or clarify the Deathstorm drop pod attacks, given how much discussion there had been about them when the 1st version of the update was released.