This Expansion Set for The Battle for Normandy allows players to extend the campaign game to the end of August, but most importantly includes the area for the Mortain and Falaise Pocket scenarios.
Counters are included to fill out Allied and Axis Order of Battles to the end of August, and also include specific breakdown counters for AT, SP AT, and mechanized infantry.

The Full Color Rules & Scenario books are updated and comprehensive, and include all original rules and scenarios plus all optional rules, and 6 new scenarios.

Counters include:

4 new German infantry divisions

1 add'l US infantry, 1 armored division

New corps units for both sides

Princess Irene Brigade & the Belgian brigade

Towed artillery units which replaced the M7s of 3rd Can and 3rd Brit inf in August

Kangeroos

British armoured car regiments (which had been intentionally left out before)

Marker counters for optional rules (Weather forecast, Commando REM repl, CW/US air & supply allocation planning)

Fire arc limited coastal batteries (10)

Counters for US Long Tom & howitzer 155s replacements (for the C3i modification)

"Tac Move", "Isolated" markers

...and more

Looks like the rulebook will come in at 40 pgs, the scenario book at 64.

Will the updated Rulebook and Scenerio booklets include all errata?

I think this probably belonged in the message board area - but yes, they will and also all of the available optional rules (including those from C3i)