Tasca, although it hasn’t appeared on their website, (At least I can’t find it) have released an M4A4 Sherman.

Tasca have had the parts for this kit
TAS 35016 1/35 British Army Sherman V (M4A4) for a while from the M4A1 and Firefly kits.

The M4A4 was mainly used by British and Commonwealth forces as well the Chinese. The US Army used it for training purposes but also borrowed some M4A4DD tanks for the Rhine crossing if my memory is correct (I wasn’t there I just remember reading it.)

Update 9 Jan 09. Just recieved details from Tasca:
Accurate model of the M4A4 with 75mm turret with extended body.
New parts include:

Late version smoke discharger that was attached to the right side of the turret

Government issued biscuit cans.

Early and late version of gun shield included

Applique armor and gun travel clamp

Working VVSS suspension.

Etched fret for engine grill, etc.

Five different marking options for Sherman V around Normandy (printed by Cartograf)

One British tank soldier figure.

Tasca are now taking preorders on their website.